@ Ishu Gupta
Buddy htpc's have a different taste altogether. You cannot simply add a 5670 and say you can game better. Do you expect to game at fullhd with a 5670? Put together, its simply not required.
Wd green is a lot better option than seagate one cause it consumes lesser power and performance isn't needed here. Speakers are an esssential component in an htpc so a 2.1 simply doesn't cut it. To watch movies hometheater style, 5.1 is a bare minimum.And for a good 5.1 a soundcard is necessary. Thats what an htpc is all about.
I would say instead of going for a powerful cpu or gpu, op should invest in a good panel and a nice 5.1 channel speaker set. Thats what htpc's are all about. If you wanna make it a gaming rig as well, then the scenario changes and high performance components fit in.
The panel you suggested is very good and is an ips panel so op can go for it but not sacrificing on speakers. A good 5.1 is a must have or else it won't be called as an htpc.