Wow, amazing deal. I, too, have had spotty service with AccessMicro, but I'd definitely take a risk on this. It's so worth it. This drive rocks (I have one).
As for ATA/100 cards: Good question. Onvia used to be the undisputed winner for controller cards, with their free shipping and lower prices. But now that they CHARGE for shipping and have RAISED prices, somehow, I don't like shopping there as much.
Don't buy a knockoff controller card. Get a Promise or the like. A "really good" card isn't going to cost you more than about $20 or $25 anyway. I got burned a couple times on knockoffs.