Itching for better sound

Your receiver really will be a limiting factor with whatever speakers you choose. The Klipsch are very sensitive and your receiver will drive them. The KEF LS50 requires a good amp with sufficient power to get the best out of them. These speakers have a different sonic signature and I would suggest you listen to them to see which you prefer. 

A speaker at the $500 price point that I would suggest is the Wharfedale Denton 80th. They are available online and you can return them if you don't like them. I actually preferred them over the KEF LS50 and I am a long time KEF fan currently running several different KEF speakers in 3 systems. 

I haven't heard one, but the latest Outlaw Audio RR2160 Stereo Receiver at $850 gets great reviews.  May be your biggest bang for the buck and tie what you already have together.

Klipsh?  You have got to be kidding.  Since when are they an audiophile speaker?  Unless, you like your ears to be drilled with high frequencies.

I agree, save up your money until you are ready.

Klipsh?  You have got to be kidding.  Since when are they an audiophile speaker?  Unless, you like your ears to be drilled with high frequencies.

I agree, save up your money until you are ready.

I recommend a Yamaha A-S801 integrated amplifier. If you don't need the Video features of your AVR this will make your PSB speakers sound brand new and will pair well with any other new speakers you bring in.

I addition you can try the built-in DAC on the A-S801 via optical/coax from your Marantz - you might prefer that clean Sabre sound. Two upgrades in one!