Almost any computer from the last three years should be fine. Here are some things to look for to ensure the program runs well:
4GB+ RAM : The more RAM the better.
SSD : A "solid-state drive" improves performance since DF reads image files from disk during playback.
13"+ screen : Don't get a tiny laptop screen!
Decent graphics card : Read reviews of the graphics card. If there are a lot of bad reviews, stay away.