I'm having hard drive problems on my MBP (3,1). To make a long story short - I'm going to replace the hard drive this weekend with a new WD 320GB. But this looks like an opportune time to upgrade to 10.6. Can I install the 10.6 upgrade on a bare drive? If so, can I restore my 10.5 Time Machine backup onto it? Or should I just go ahead and install 10.5, restore, and then install 10.6? Thanks in advance for any advice!