Dan,
I can't really speak to the amplifier. I don't have much experience there. I have a Pioneer Elite. It's several years old and I am very satisfied with it.
As far as the academy, it is better than I even hoped for. Completely changed my system for the better. It replaced a Klipsch SC-1.
I am happy that I got it here from a forum member but another good place is http://audiogon.com/. I paid 400 for mine which is pretty average. You probably won't find a good condition unit for under 350 and shouldn't pay more that 450 in my opinion. Ebay probably wont save you much if anything and you never really know who you are dealing with. That said, I'm sure many fine speakers are sold on ebay, some by members of his forum (although they are commonly offered here first).
I have klipsch SS1 for surrounds and they seem ok to me. One of the things I heard a lot when asking these questions that you are is that the surrounds really do not have to be stellar to work well. I think they should be surrounds though. Directional speakers will not work as well. As the result of some advice I got, I may eventually upgrade to KSP-S6 or similar, maybe RS-7 if I have the money. Again, you don't really need to spend as much on these to get good results.
So, in summary, academy is great and worth getting from someone here or audiogon.com I think. Ebay is probably fine, but I like getting a used speaker from someone who appears to care about them. The one I got from USNRET was great and so was he to deal with.
Good luck
JK