exactly my point. everyone should have two drive already, and almost every case can accommodate a 2nd ssd even if not designed to. you should have one os drive and one storage (optional) drive.
120gb is an excellent os drive size right now. and 120gb ssd's add less then $100 to your system. if you cant afford that then just keep telling yourself its ok 'because its an htpc'. forget the fact it still runs full blown windows and all...