Want to sell my Macbook pro...necessary steps

So, I want to sell my Macbook Pro, not because I don't want it but because I want to upgrade. I live overseas and can sell my 18 month old Macbook Pro and pay a small amount extra for a newly refurbished model (I travel often to the US). This would give me an updated computer with a fresh warranty...plus help out someone else. It's a win-win.

I found a website once that explained how to prepare your Mac for sale and make it up to date. In other words, update the OS and let the new buyer get the fancy welcome screen.

Basically, I have the install disks from the original purchase (pre-SL OS) and the SL upgrade discs. I would like to also purchase Lion, but this won't have any discs.

Is there anyway to delete my data (have TM of course), update with SL and then to Lion, while allowing the new buyer to customize like a first-time purchase?

Follow this link: How to make a bootable Lion install disc or drive | Operating Systems | MacUser | Macworld

With the installer for Lion in hand..do a fresh install on the machine, when the system goes down for a reboot after installation, turn the computer off and when the new owner starts up the computer it will go through the welcome process..

Thanks...but with this process doesn't the new owner have to update the machine?

The link that I had read in the past described a way to make the machine totally up to date before the sale. In other words, the new owner turns on the machine and the only update to any OS software is from between my shutting it down and their turning it on.

That's correct..if you create an installer for Lion and do a fresh install, when the new owner turns the Mac on and starts using it only new updates to Lion will need to be downloaded, since there haven't been any updates to Lion yet..it'll be as new as anything else..

Actually, I see that it is a bootable version. Maybe that would work.

I guess I should try out Lion first though.