[Sony Xperia M] Bonoboo:
So don't install so huge gapps package, use Pico and then install manually what you need from Play.

Also here Google Translated list of CM's system apps that can / not be deleted:

/system/app

Apollo.apk - Can - music player.

BasicDreams.apk - Can - live wallpaper.

Bluetooth.apk - not recommended - to work for Bluetooth.

BluetoothExt.apk - Not recommended - addition for Bluetooth.

Browser.apk - Can - a standard browser.

Calculator.apk - Can - Calculator.

Calendar.apk - Can - Calendar.

Camera2.apk - Can - Luggage.

CertInstaller.apk - You can - to work with certificates.

CellBroadcastReceiver.apk - It is possible - for the reception of broadcast messages.

CMBugReport.apk - Can - bug-report developers CM.

CMFileManager.apk - Can - file manager.

CMHome.apk - You can - similar to Google Now CM.

CMWallpapers.apk - Can - standard wallpaper.

DeskClock.apk - Not recommended - hours.

Developement.apk - Can - functions for developers.

DocumentUI.apk - not recommended - the application "Documents", you often need to select the files.

DownloadProviderUI.apk - not recommended - the application "Downloads".

DSPManager.apk - Can - equalizer.

Email.apk - Can - email application.

Exchange2.apk - Can - addition to the e-mail application.

FM2.apk - Can - FM-radio.

FMRecord.apk - Can - addition to the radio app for recording from the air.

Galaxy4.apk - Can - live wallpaper.

Gallery2.apk - Can - Gallery.

GoogleCalendarSyncAdapter.apk - Can - application to synchronize the calendar with Google.

GoogleContactsSyncAdapter.apk - Can - application to sync contacts with Google.

HoloSpiralWallpaper.apk - Can - live wallpaper.

HTMLViewer.apk - can not be - a system component to display web pages.

KeyChain.apk - can not - work with key applications.

LatinIME.apk - if you have a side of the keyboard, you can.

InCallUI.apk - can not - Talking screen, without the phone will not receive calls.

LiveWallpapers.apk - Can - application for "processing" live wallpaper.

LiveWallpapersPicker.apk - Can - application to select the live wallpaper.

LockClock.apk - Can - another clock widget.

MagicSmokeWallpapers.apk - Can - live wallpaper.

Nfc.apk - Not recommended - application for NFC.

NoiseField.apk - Can - live wallpaper.

PackageInstaller.apk - can not - installer .apk.

PacProcessor.apk - Can -?

PhaseBeam.apk - Can - live wallpaper.

PhotoPhase.apk - Can - live wallpaper slideshow from your gallery.

PhotoTable.apk - You can - set of wallpapers.

PrintSpooler.apk - Can - application to manage the printer.

Provision.apk - Can - saves the data after the initial setup.

SoundRecorder.apk - Can - recorder.

Stk.apk - Can - menu SIM-card.

TelephonyProvider.apk - can not - you need to call.

Term.apk - Can - terminal emulator.

Torch.apk - Can - Flashlight.

UserDictionaryProvider.apk - not recommended - to save the unknown words to your personal dictionary.

VideoEditor.apk - Can - a simple video editor.

VisualizationWallpapers.apk - Can - live wallpaper.

VoicePlus.apk - It is possible - to create rules calls via Google Voice.

WAPPushManager.apk - Can - receiving WAP-push messages.

WhisperPush.apk - Can - protected messenger from CM.

/system/priv-app

BackupRestoreConfirmation.apk - not recommended - you need to restore from backup Google.

CalendarProvider.apk - Can - addition to the calendar.

CMAccount.apk - It is possible - for logging in to the CM-account.

CMUpdater.apk - Can - updates on the "air".

Contacts.apk - Can - app "Contacts".

ContactsProvider.apk - Can - the repository of contacts.

DefaultContainerService.apk - can not - you need to install the application.

Dialer.apk - can not - dialer.

DownloadProvider.apk - not recommended - the system "boot" file.

ExternalStorageProvider.apk - can not

FusedLocation.apk - can not - provider location.

InputDevices.apk - Can - Assistant when working with a full keyboard.

Keyguard.apk - can not - lock screen.

MediaProvider.apk - can not - media scanner.

Mms.apk - Can - application for SMS and MMS.

OneTimeInitializer.apk - Can - something for the initial setup.

PicoTts.apk - Can - voice engine.

ProxyHandler.apk - Can - helps applications to connect through a proxy server

Settings.apk - can not - the application "Settings".

SettingsProvider.apk - can not - the repository "Settings".

SetupWizard.apk - can not be before the first boot after possible - the initial setup.

SharedStorageBackup.apk - not recommended - you want to sync with Google.

Shell.apk - You can - you need to create a full bug report.

SystemUI.apk - can not - the system interface.

Tag.apk - Not recommended - processing application NFC-tags.

TeleService.apk - can not - you need to call.

ThemeChooser.apk - not recommended - the manager.

ThemesProvider.apk - can not - the handler.

Trebuchet.apk - if you have installed third-party launcher, you can.

VoiceDialer.apk - Can - voice dialing.

VpnDialogs.apk - You can - you need to configure the connection via VPN.

WallpaperCropper.apk - not recommended - you need when you change the wallpaper by Trebuchet.