I will say that having both garrison and marines on hand is probably a waste.  Trained garrison works about as well as green marines, though.  Neither will see much action, after all, since they only work on the ground.  I will also say that sentries, raptors and guerillas seems a bit heavy on combat support, since none of them really work in combat.  I would get rid of Raptors *or* Sentries, probably raptors since they are more costly and no one is interested in playing a raptor pilot.<br/><br/>6: Mark V (10) - Green<br/>3: Sentries (10) - Green<br/>3: Guerillas (10)- Green<br/>4: Garrison (100)- Trained<br/>16 Total<br/><br/>You have enough points with this setup to train two units or just buy a unit of Mark IIs.  Either way works well, in my opinion, and comes down more to preference.