With my GTX 285, I'd have to swap it out for my 8800 GT and then put it back in, so i can't really install Leopard on a new drive and then upgrade,
I need to upgrade straight from SL which should have (better have) the drivers for the GTX 285.
I think I might just.. do nothing lol, wait for a few updates, then buy the disc with the updates on it (like 10.6.2).