Yea if you want CQB velocity the M90 is the safe bet. An M100 will likely put you right around the limit so it may or may not be over 350 FPS. The M110 would be my choice for an outdoor gun. In my experiences it usually gives you 380 FPS.
However, for now and the future, upgrades and parts make a huge difference in FPS. For example, I have a DMR with a M110 spring that shoots 430 FPS, and had an M120 in another gun shooting 420 FPS.