From what I've read lately, your choices seem to be VERY limited. Other than Baseball Mogul (which does sound like a fun game to me), no baseball games seem to have come out for the PC in a couple years.
I'm still playing High Heat Baseball 2003 (cause I LOVE It

) and I have a copy of MVP Baseball 2005 which is okay (i.e., I'm more into baseball simulation than arcade baseball). HH2004 is similar to 2003, but I believe "mouse support" is not included with 2004 which is a bummer (I didn't buy 2004 due to lack of mouse support).
Seems HH2003 sells for a premium new or used. Here the link via Amazon.
http://www.amazon.com/gp/offer...&qid=1198860327&sr=8-1
You also may want to check out BaseballSimCentral.com for ideas.