Go for the SF-3's! And if you are going to add a center channel buy the SC-3. At first I bought the SC-2 and the timbre was all wrong for the 3's so I took it back and got the SC-3.
I have the 43TX and cannot say enough good about it! The 43TX should be a consideration also, an older model that may save you a lot of money. I use the larger KLIPSCH SYNERGY speakers and it is truly an awesome sound.