this is a hard question, 10 is not many
my 10:
The Longest Journey
Interstate '76 (even though it's not the most well-adapted game in the catalogue, it's a must-play)
Planescape: Torment
Fallout 1+2
TIE Fighter
Gabriel Knight 2
Arcanum
Gothic 1+2
Thief 1+2
System Shock 2
HAH, I put more than 10~
It's good you only ask for 10, because, you should really pace yourself with your acquisitions. Wait for sales, they're pretty frequent, though, the Star Wars, D&D, and a bunch of other great titles (you can ask around) have already been on sale in the past 6 months, so, if you're itching for any of those, it might be good to just go ahead and get them because who knows when they'll come on sale again (the D&D comes pretty frequently, SW has only been on sale once, but they also haven't been here that long, but probably won't go on sale again for a while, my guess would be holiday times.)
Post edited August 28, 2015 by drealmer7