Everyone has their personal opinions so your responses are going to vary!
For your budget I like (and is very similar to mine

):
<b>Receiver</b> Onkyo TXSR-702 $799.99 but going for $549.99 on CircuitCity.com!! Wow!
<b>Front Speakers</b> Polk Audio RTi8 $839.99 Pr.
<b>Center Speaker</b> Polk Audio CSi3 $239.99 Ea.
<b>Rear Speakers</b> Polk Audio RTi4 $319.99 Pr.
<b>Subwoofer</b> Polk Audio PSW-505 $549.99 Ea.
<b>Total:</b> $2500 on the nose. (if you go with the CC Onkyo

)
That speaker setup is identical to mine but I have a Marantz SR-6400 Receiver. I would have an Onkyo, but I got a super deal on the Marantz!
Happy shopping!
~Chuck
PS. Prices taken from <a href=www.polkaudio.com>Polk Audio</a> and <a href=http://www.circuitcity.com/ccd/Search.do?c=1&context=&keyword=txsr702&searchSection=All>Circuit City</a>
More info on the receiver can be found at <a href=www.onkyousa.com>Onkyo</a>
EDIT: Those Polk Audio speaker prices were taken from Polk's website. You can probably get them much cheaper from an <b>authorized</b> Polk Audio dealer/website!