Home Theater System & Stereo System?

So I have a pretty decent home theater system. I'm quite pleased with it and life's good. But now I'm looking for a stereo system. And here's my dilemma. Home theater speakers and music speakers are (generally speaking) two different beasts, right? I mean, home theater systems are generally dedicated to very specific audio ranges (center channel for mids, surrounds for mids and highs, and subwoofer for lows). But, from what I understand, stereo speakers generally don't use subwoofers because it's extremely tough to calibrate with the rest of your system. So your stereo speakers need to be able to handle the entire range (20 - 20k).

So my question is this: Should I get 2 new speakers for a stereo system or are my assumptions about home theater vs. music speakers incorrect?

And, on that note, let's talk for a second about receivers. Talking to a friend from work (a MAJOR audiophile), he mentioned that receivers also affect the sound that they output. My reciever (Denon) apparently is designed for home theater whereas a reciever designed for music systems (like an Outlaw) would typically give a much warmer sound.

So question number 2: Should I get a second receiver for my music system or is my assumption about the receiver's effect on the sound it produces incorrect?

Thanks, everyone! And, of course, max points for best answer!