I can keep up to three. For each player I keep I lose the draft pick in the round I drafted them in last year. My options are Arian Foster (round 1), Nicks (round 2), Brady (3), Gore (4), Vincent Jackson (5), RGIII (6), Heath Miller (14) and SF Defense (15). Our rosters are QB, 2 RB, 2 WR, TE, K, DEF, standard points in H2H
Foster is obvious, but no one else is. I'd probably keep 1 of the QBs (whoever you like best...my choice would be RG3) and SF. Everyone else you can draft later than the round you spend by keeping (except VJax, but I'm not a fan).