I'm thinking of putting together a htpc myself.budget around 3000 $.Here's what i've come up with so far.
SONY KDL-26S2010 BRAVIA LCD
COOLERMASTER RC-732 PRAETORIAN 732 SILVER
THERMALTAKE W0105 TOUGHPOWER 700W
ABIT AB9 PRO
INTEL CORE 2 DUO E6600 2.40 GHZ LGA775 - 1066 FSB - BOX
OCZ pc 5400 2x1 gb
SAPPHIRE ATI X1900XT 256MB PCI-E LITE RETAIL
SEAGATE BARRACUDA 7200.10 ST3400620AS 400GB 16MB SATA2 NCQ
PIONEER DVR-111D - BLACK BULK
CREATIVE SOUND BLASTER X-FI MUSIC
LOGITECH Z-5400 THX
If you want you can throw in a logitech universal remote for the tv and the speakers,plus you can have a look at media cases for pc (silverstone etc.)but i wouldn't go with that because of the small space and heat of these cases..good luck..i know i'll need it..