Here's my philosophy behind the receiver recommendations that I made earlier - buy the least expensive receiver that has all of the features that you want now and for the next couple of years. This is assuming that you aren't looking at the $5k class of receivers, but rather the $500 to $1k class. Why? Because technology keeps getting better and cheaper. Surround sound formats change, connections change (composite video went to s-video, which went to component video, which went to HDMI, which will go to something else), and so forth.
I spent $1k on a receiver back in late 1997, and really stretched my budget to do it. Oh, baby...it was the stuff. The first Dolby Digital receiver at or under $1k. I was cutting edge and sooo happy...for a very short while. Fast forward six months from then. DTS. Hmmm, what's that? A surround sound format that my receiver can't play, and my receiver didn't have multi-channel inputs (no one talked about them at the time). Prices plummeted, and then newer formats came out. That was the last "cutting edge" receiver that I plan on ever buying.
You don't need to be in that type of position, though. The $400 class of receivers has the latest surround sound decoders and the latest connections. I say get one of those, be happy, and if you want to upgrade in the future, get one of the $400 receivers at that time. Then, you've spent less than you would on a "future proof" receiver today, and let's face it - none of them is future proof. They aren't really even two-years-from-now proof, IMO. $400 is just an example amount, but I hope that my reasoning came across.