Western Digital 750Gb + Asus AM2+ board @ EYO $315.
This is a bundle put out by EYO.
The WD drive is pretty good on its own (HDD SATA, Western Digital, 750GB GreenPower 7200RPM 16MB SATA II HDD ) and has a price range of $218 at EYO through to $260 upwards elsewhere.
The board supports quadcore so its got a reasonable lifespan. EYO flog it for $121 with the medium being about $130.
You need to add them both to your cart and then use Bundle6 in the Special Instructions Box - they will manually adjust the price when they process the order.