HTPC menz!

Converting my old PC into an HTPC and I bought the HP Media Center Remote Control online, mainly because its sleek and nicer looking than the Microsoft version. However, when I received it in the mail today, it didn't come with an IR receiver... sooo I called HP and asked what the deal was. To the surprise of the guy on the phone, it doesnt come with one (lol), so he refunded me for the whole thing and I got to keep it free of charge.

Now I need to figure out an IR Receiver I can use with it. my ATI TheaterPro 550 came with a crap remote and IR receiver.. can I use the receiver with the HP remote? If not, can I get an internal IR receiver and can someone recommend one that works with MCE remotes? Any suggestions would be greatly appreciated! :O