I've been lurking on this site for a while and I have browsed/search the forums and most people want a gaming HTPC or a high end one. I'm not new to building PCs (I just built a desktop with an i7 2600k, gigabyte z68xp-ud4, 16 gigs ram (it was cheap), and gtx 550 ti). Desktops, I'm pretty familiar with. This new mini itx/micro atx (with a small case) I'm not too good with. If i get a mini itx, how do I know what video cards are compatible (small enough to fit) with the mini itx? If someone could possibly help me out with a build, micro atx or mini itx, that would play HD 1080p videos. I want to spend under $400 but what ever has to be done, has to be done.
Oh, and I plan to buy within the next two weeks. I have had AMD my whole life for like the past 12 years with a AMD 800mhz processor to a AMD athlon x2 5200. I just decided to go intel with my latest build and I'm hooked. However, if gpu is better on a AMD, I can deal with that.