First off, don't count on tigerdirect's rebates. People have said that they never return the money and if they do ti will be like a year later. I say dont ever deal with rebates unless you are willing to pay the full price anyway and the rebate is just a bonus, but if you are buying the product just for the rebate then dont count on it. I like that barebone, Nice case, pretty good mobo, not sure about the cpu since AMD hasn't made a Sempron 3300+ for socket A, but it could just be a mistake. IMHO just save up your money to get a socket 939 athlon 64 and just keep your p4 1.8. I say go sempron 64 or socket 939 athlon. Socket A is dead man, It isn't future proof. If you want sempron get a socket 754 one.
BTW: why not just get the videocard at newegg.com it is more reliable and you will most likely get your rebate back.