almost any model from Denon's new lineup.here is a link to Denon
I have a 4310ci they retail for $1999.00 but I bought mine for $1299
A good rule of thumb is your receiver and your speakers should cost about the same.
other brands are:
Yamaha = pretty good
Onkyo = high failure rate
Sony = good quality but so so sound
Integra = same as Onkyo
Marantz = ok sound but so so quality
I should probably not point out that most Audiophiles look down upon the Bose corporation.
Bose was the first to introduce the satellite / subwoofer system to the market back in the early 80's and has a big presence in professional audio. However their design does not produce neither crisp highs nor substantial lows. the basics of audio are that sound is produced by moving air, the more air you move the more sound. Bose has definitly found a way to "cheat" by utilizing both forward and rearward motion of the cone by encosing it in their " accoustimass" module but many of the frequencies required for true clarity are merely lost due to the drivers inability to create them.
If you choose a receiver such as one from the Denon line they have a feature called "Audyssey" Audyssey uses a microphone to calculate room acoustics as well as to apply equalization to help make up for what the speaker isn't producing enough of.
Now usually when you disrespect Bose you always get someone upset and having sold Bose myself for YEARS I would only argue take a grill off. Instead of a high quality tweeter or woofer you will generally find a cheap paper component.
There is a purpose to me going off in a tangent about Bose. IF you are considering replacing your receiver because you feel that its not driving the speakers to your liking or maybe isn't "clear" enough then unfortunately my diagnosis isn't that you need a more powerful receiver but better speakers.
The purpose of upgrading a receiver should be more to get updated surround processing, better video distribution, multi room audio video etc..Unfortunatly unless you are trading up from a 80's low end: Pioneer, Technics, Kenwood, Sherwood or Sony the sound improvement won't be that great.
Sorry but hope that helps