Thanks for all the helpful info!
I went to the store and listened to the speakers, I wound up just buying the procenter 1000 center speaker. I think I'm going to save up a little more money and get two good tower speakers to go along with it, i'm thinking something in the $600 - $700ea. range.
I hooked up the new center channel and 2 old bookselfs speakers I had laying around to replace the small speakers that came with it. Wow, it's an amazing difference already! Spoken dialog sounds great, it was exactly what I was looking for.
I can't wait to keep adding to it. ...resisting urge to use credit card