While the 30 GB WD (5400 RPM) drive may seem like a good deal, why not just pick up the 30.7 WD 7,200 RPM ATA-100 drive at CompUSA for $119.99 - which is the everyday price? SKU - 278084.
Also, this drive is $129.99 @ BestBuy this week, but they give you $15 off instantly towards the purchase of any DVD movie. Have them price match CompUSA and get a free movie - all for $119.99 + tax.
Edit: BestBuy blows! What I have described above will not work. BB will drop the price down to $119.99, but then the $15.00 off of a DVD gets negated - and the cashiers (being clueless and all...) can't figure out how to handle the transaction. So, the best bet is to pick the 30 GB, ATA-100, 7,200 RPM drive up at CompUSA for $119.99 - no price matching required.