Re: System for under $3000
What David suggested is a pretty good system. You'll get tons of opinions on it so ultimately you'll have to decide for yourself. I do agree on the blu-ray player, shop around and you can find a BD35 for $200. I got mine from Amazon with 6 free blu-ray movies for $210. My 'opinion' is that I prefer plasma over LCD. Only buy a Panasonic or Pioneer for plasma, no other brand.
If you spend too much of your budget on the tv and only have say 500-700 to spend on audio and blu-ray, this is the only system you need to look at:
Onkyo | HT-S5100B 7.1-Channel Home Theater System | HT-S5100B
You won't get the HD audio from blu-ray with the receiver but that's the way it goes, it's the best home theater in a box for sure. Speakers are big but trying to get good sound from small speakers will be expensive.
This will be the best home theater in a box you can buy:
Amazon.com: Onkyo HT-S9100THX 7.1 Channel Receiver and Speaker Package: Electronics
Once again if you are a great shopper you could find a better system but it will be hard for under $1000 for the receiver (with blu-ray HD audio) and speakers including a good sub. I did speakers, sub, receiver and blu-ray player for $1000 but I am a great shopper and did it over 2 years.
If you shop around and find the Panasonic 50" 720p plasmas for $900 then you have $2k to spend on audio and it opens up all sorts of audio options.