Splits can be found two main ways.
1) You can click on the player's name in Yahoo to bring up their page and click on the "Split Stats" tab near the top.
2) You can go to http://www.baseballreference.com
and search the player there for whatever you need.
As for your dilemma, you mentioned 4 OFs. I would first try to put one on your Util spot, the other 3 in your OF, thereby using all of them. Or, as previously mentioned, try and trade 2 for 1 - say, Hart and Rasmus for Braun? Or something like that. Find a team in need of 2 great OFs and send out a flier for their best player. Make sure it's at a position you could use though. You could also deal an OF for a SP as mentioned. Either way, it's always good to be in the seat of having guys to give up rather than needing guys to fill in.