Separates or Receiver for 2K

I've got Harnman Kardon AVR525. If I would use it as prepro and if I would get Rotel RMB-1075 amplifier, would I get much better sound?

I have a Lexicon CP-3Pro ,but I have not inserted it my system yet.It should be alot better than any reciever going because it will allow my to keep my 2ch. away from my HT in the same system using a Passive Preamp with a 5ch. amp and a Dedicated 2ch. amp for the mains.

I cannot imagine spending $$ to screw up 2ch. playback and that is what people do by buying HT recievers.

JMO

Ideally, if I am to combine home theater with 2 channel music, I'd buy a higher quality preamp and 2 channel poweramp then add the processor and 3 channel amp. However, it would be hard to get all this below $2K plus mucho cables. So, for $2k, I'd go with a receiver especially considering most poweramps within this price range are not that much more musical than receivers to begin with.