I've got a desktop at home that I use for streaming all my media to my 360 (in a different room, all hardwired). The problem is that any HD content I have from BD backups, to trailers, to HD DVR videos, can't seem to transcode at a respectable speed. I've tried using Tversity and Media Center but there's a bottleneck somewhere I need to break. I'm assuming it's my CPU. All my DVD backups run fine.
I'm currently running: Core 2 Duo e6400, nVidia 8800GTS 640, 4GB Corsair XMS2, ASUS P5B Deluxe
I've been considering upgrading to an i7 920 (plus mobo, RAM), but I'd much rather stick to an upgrade under $500 that would still allow video transcoding at maximum quality.