I'm planning on building my first HTPC in the near future. It will be used on a regular basis for Netflix, watching twitch.tv streams, and it will probably see some light gaming (Castle Crashers, PS2 Emulation, Super Meat Boy, etc). Won't be playing anything that requires too much graphical processing power.
I'm hoping to spend sub $400 CDN. I won't be building this HTPC until Q1 of 2013.