Home Theatre Receiver Conundrum... Shut up and take my money!!!

Hi guys, first post for advice so please let me know if I'm a little light on detail.

I'm in the process of looking to upgrade my receiver for my home theatre and to be honest I usually have more dollars than sense, so tend to use as much money as possible to fix my problems without really seeking out all the options I have available or what is realistically appropriate.

Currently I'm running;

Receiver: Marantz NR1402

Fronts: Polk Audio TSi500's

Rears: Polk Audio TSi400's (yes I realise these are probably overkill, see above tendency)

Centre: Polk Audio CS20

Sub: Polk Audio PSW12

Cabling: AudioQuest Rocket 33 cables to TSi500, AudioQuest G-2 to TSi400 & CS20, AudioQuest Sub-A to sub.

Basically I'm looking for guidance for an appropriate receiver to power the above for maximum clarity - I don't tend to slam a lot of volume through these but feel the NR1402 isn't quite keeping up. And most of the sales people I deal with seem to see me a walking commission cheque. My budget is roughly $1,500 for this piece.?

Please let me know if anyone needs any more information