I'm one of the newer members here. Just got into the home theater stuff several months ago and am having to do it on a little bit of a budget because I'm still in school.
What I have:
HTPC:
AMD A8-5600k
Silverstone SG01B-F Micro-ATX Case (Silverstone HTPC cases were just *slightly* too large for my entertainment center)
8 GB G.Skill Ripjaws X Series RAM
120GB Sandisk Extreme SSD
MSI FM2-A75MA-E35 Motherboard
CX430M 430W PSU
No optical drive (I have a portable one for software installation and a PS3 for playback if needed)
TV:
Samsung PN60E7000 Plasma 60"
Receiver/Speakers: (Remember, budget!)
Pioneer VSX-522
Sony SSF6000 Floorstanding
(Still looking for a decent/cheap sub & center channel)
Others:
Playstation 3
Nintendo Wii
Router/Modem
I'm still working on configuring XBMC and getting a few more things for my setup, but it's coming along.