Yes, everything you've heard is true... buying Bose is like thinking you're buying a Toyota Camry (at the Camry price) and getting a Ford Pinto instead.
Do you have a Costco in the area? Call around to various stores and see if they have physical stock of the Pioneer SC-1522-k receiver. Only $600 (even worth the price of a membership) for a veeeeeery nice 9.2 channel capable receiver with all the bells 'n' whistles (MSRP was $1,600). This is an absolute steal.
If you strike out... Newegg.com has the Pioneer SC-1222-k (the next model down) for $550. Still a great deal since it was over $1,000 originally.
You could also look at a refurbed Denon AVR-3313CI direct from Denon's site at $699. It has Audyssey MultEQ XT auto room correction, if you find that appealing and worth the extra money.
I'd get one of those before buying a Sony receiver. I find their receiver quality suspect from experience (and from other things I've read).
I hate to tell you, but the speaker locations you're mentioning are probably the very worst places to mount speakers.
Here's a basic diagram of a typical 7.1 channel layout.
Front L/C/R array has tweeters at about ear level when seated (or as close as possible). Tweeters of the surrounds are usually placed 2-3 feet above your ears at the primary seating location and mounted on the walls. Side surrounds are placed at 90 degrees to the listener's ears, and the rear surrounds (if you go this route) at 150 degrees.
Klipsch speakers tend to be harsh and fatiguing over the space of a movie.
If you're looking to save a buck and get great speakers in the process, Ascend Acoustics (internet direct) is having a sale right now. One of the great deals is a pair of CMT-340 SE monitors with the free matching stands (using the sale link off the main page). Get another CMT-340 SE C for the center, and HTM-200 SE's for the surrounds.
600 sq feet is nothing to sneeze at, so you should save up and get a couple of good subs. Check out Rythmik, SVS, HSU, and other internet companies for the best boom for the buck.
This combo will absolutely decimate and then crush Bose speakers and bass "modules" into a fine powder.
Is this room an open living room or basement? Going to be a dedicated home theater space? Etc. Etc.