Clean install from Leopard to M. Lion on new disk

I have a late 2007 MacBook Pro with 10.5.8 and a too small disk. I just purchased a 500GB internal disk. I'd like to do a clean install from Leopard to Mountain Lion using the new disk. What is the recommended procedure? I'd like to avoid the extra step of installing Snow Leopard first as documented.

Well, I wouldn't do it that way, too many steps.
I would:
1. Clone your current drive to the external drive, instead of using Time Machine. (Carbon Copy Cloner or SuperDuper)
2. Boot from your external drive, update it to Snow Leopard.
3. Purchase and download ML from that external boot. Save a copy of the installer to a location other than the Applications folder, that way it won't be erased after you use it. (verify that you've made a copy and not just an alias)
4. Install your new drive, format it.
5. Boot from your external, run the ML installer, select your new empty internal as the install destination, when prompted, use Setup Assistant to migrate your data from the external to the internal.
6. When done, you should have a fresh install of ML on your new internal and a bootable SL on your external as a backup. If you decide that you want to go back to SL, you can just erase the internal and clone the external back to the internal.
Note: You don't need to make a bootable USB installer, they're too slow anyway. Just keep a copy of the ML installer on your external, bootable drive, so that you won't have to download it again.
Another option: Since you're replacing the intrenal with a 500 Gig drive, you could partition it to two 250 Gig partitions. Put ML on one and SL on the other, i.e.,

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