I have used SanDisk Extreme III, as well as SanDisk Ultra II 2 & 4GB cards and didn't really see too much difference in them. The Ultra IIs are cheaper, but they sometimes have GREAT rebates on the Extreme IIIs bringing the price down to like $15 after rebate.
I would also look into Kingston brand. On Buy.com they recently had 8GB cards for a crazy price---maybe $10 each---not sure if they have those anymore though.
Whatever the case may be, make sure you bring enough. The file sizes while shooting with the D60 (or any other dSLR) will be much bigger than those with a p&s and you may easily go through 4GB in memory per day depending on how much shooting you do.
Also---a tip that is frequently given out on this board is to NOT erase any pictures in camera. Even if you review them on the LCD and know that it isn't a good shot, or someone blinked, or it's blurry---keep it and delete it once it's on the computer. Apparently, the chances of getting corrupt files increase when you delete photos in camera.
Good luck and can't wait to see soem pics!