You've got a good team. It should contend, but not win. You might be better off with Thomas and Sexon playing over Helton.
I like your OF and having Hart and Young to back up Taveras.
If Thomas and Sexon play well and don't get hurt and if you can get one more closer for more saves, you might proove me wrong and win this year. Otherwise, you're building a solid foundation while contending, no easy feat.
Hope this helps. Please check out mine, too: http://www.fantasybaseballcafe.com/forums/viewtopic.php?t=260441