Looking at your team, I like your closers (having 4 is great), starting pitching, David Wright and your outfielders.
However, like some of the other posters, I am not really sold on your offense as a whole. Both Molina and Towles are serviceable but it would be better to only have one (or even better, pick up the hot handed FA catcher every couple weeks and play them out). Although Butler & Swisher could be placed in your 1B slot, you should really look for a better upgrade. Most analysts say that Butler should hit between 15-20 home runs and Swisher, while a good power hitter, will also lower your AVG.
You will need more power and speed. When I looked at your team, that was the first thing I was thinking. I found an article from Yahoo about average stats you should be targeting (this came out before the season started.) Here is the link: http://sports.yahoo.com/fantasy/mlb/new ... oa2_022508