I actually am probably going to get an HTPC anyway and the x360 becomes moot.
Don't do that. I have A LOT of experience with HTPCs and I can say with certainty that if your goal is to watch media, HTPC became completely obsolete after networked media tanks like Popcorn Hour and iStar came out. There just isn't a single reason why you would choose all the pains of HTPC tweaking, crashes, Windows, codec crap, unexplained problems with codecs overlapping and so on. Before NMTs HTPC was the only choice if you wanted to watch all the media you can download... but thank god that isn't the case anymore.
Take my advice and forget HTPC.