Hi Jt88,
My first investment in HT 4 or 5 years ago was with a 575.
It is now in another room and I don't think the power has been turned off more than 3 times in all those years and it has worked great at I think about 70 or 75w per channel.
Before you invest, think of the size of your room and if you upgrade your speakers you will need enough juice to fill the room and get the best from your speakers. You therefore would prefer a reciever thats strong enough to give great sound at low volumes.
I basically followed my brother and used Paradigms which are excellent value and worked very well with the 575. I understand that Axioms are also a happy marriage and I still use a pair of wall mounted dipole qs4's for surround in film but if you have just one pair of surrounds and listen to music alot, direct firing of either would be great and if you can get a matching set of 5 it will really help if you like dvd-a and sacd.
Peter m.