The Baseball Stars

I am trying to decide what I should do about my team's first base situation on my fantasy baseball team. I have just recieved Casey Kotchman in a trade as my new first baseman, but Mike Jacobs is available on the free agent list. Who should I choose? Here are some stats for each?

Casey Kotchman-1B-Los Angeles Angels-Age 25-5th season
2007 stats:
137 games/443 at-bats, .296 BA, 11 HR, 68 RBI, 2 SB
MLB.com's 2008 stats projections:
.301 BA, 13 HR, 72 RBI, 2 SB

Mike Jacobs-1B-Florida Marlins-Age 27-4th season
2007 stats:
114 games/426 at-bats, .265BA, 17 HR, 54 RBI, 1 SB
MLB.com's 2008 stats projections:
.269 BA, 26 HR, 82 RBI, 2 SB
Its a head-to-head league with 20 teams. My lineup is:
C-Victor Martinez
1B-Casey Kotchman
2B-Jeff Kent
3B-Adrian Beltre
SS-Derek Jeter
OF-Vernon Wells
OF-Jay Bruce
OF-Lastings Milledge
UTIL-Frank Thomas