What separates should I use for my vandersteen 1c?

I have a pair of vanersteen 1c's and a crappy onkyo receiver because I haven't figured out which separates to buy. I don't want to spend more than $5000 but I am open to all suggestions! as far as my taste goes, I just want to get the best out of the speakers. I love the thought and look of tubes, but haven't heard any and don't know a lot about amps in general. Im looking at the Anthem audio PVA 5. Thoughts? The rotel 1570 processor is good I hear but not the RMB 1565 amp... Please help! Thanks everyone.