Confused

I am buying Klipsch's RC7-Center, RF-7 Front, RS-7 Rear and I'm not sure of what Sub to buy. I want to try and keep the whole cost, receiver and speakers, under $6000. The speakers will cost me roughly $4000 so I will have around $1750-2000 for a receiver.

I bought a HK AVR510 & Infinity Interlude Speakers (IL36c Center - IL60's Front w/500 watt built in Subs -and IL40's for rears,only because I wasn't planin on getting IL60's) and I'm not happy with this setup. So I am now buying Klipsch RC Reference series a all around and I want to get a new Receiver to power them. What do I go with? I don't mind buying flagship receivers as long as they are worth it. I have heard so much now about Yamaha, Denon, Onkyo Intergra and HK's new upcoming AVR8000 that I am to the point of selling all my speakers and equipment and just go back to standard TV sound. I want this system mainly for DVD's and Gaming (PS2, Xbox and GameCube all of which have optical sound) but I would like a receiver that sounds great when my son pops in a CD. Also what is the any input for the RC series Speakers? Are these more for hometheatre, music or both? Is this a wise choice for the speaker setup? Thx for any info.