If you purchase used equipment, you can sell it later on to upgrade. The scope is not a real brain teaser. The camera is. I recommend that you get a camera that can be temperature regulated. Without regulation, you'll be shooting lots and lots of dark frames.
Regulation is a huge factor in consistency.
Another thing you need to decide is if you want Anti Blooming or not. Many of the expert imagers that I know choose not to get this feature because it severely expands exposure time for faint detail. You'll also need to figure out the field of view you are interested in. I'm using an ST8 which is a beautiful camera. But with a C14 at F7, the FOV is only 12 minutes or so.