Receiver upgrade advice!!

Really need advice from everyone on this- my current setup includes Polk TSX 440t's in front, TSX 250c center, OWM 5's in back, and OWM3's front height, no sub currently, powered by a DENON X2100 receiver. Small, simple system, in a smaller room (12 x 15) but sounds pretty good. So, I have an opportunity to upgrade the receiver- my two options are an ARCAM 390 for $2500 or the DENON X4500 for $1599. I've heard the ARCAM and cant believe how amazing the sound is, but cant justify the $$. Is the difference in sound worth the $$? Just had to ask.

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