Hmm... Interesting, we are about at the same spot right now. Currently I have a 18-55, FA 50, and 77 (amazing, is it not
?). Anyways, if you can find a frys next to you I would highly advise you to try to get the 50 for 90 bucks. But yeah, its a great lens that even matches up nicely to my 77. Between the 50 and the 43, I think its smart to save a little and go for the 50 since it is a bit faster and still of superb optical quality. If you want something wider, go for something in the 30 range (you should be able to assess your needs through the kit lens).
Also, have you considered a telephoto? I'm really interested in the 70-200 tamron right now to cover that need, I feel that's been lacking in my current lineup.