Will Snow Leopard (if released) come with the refurbished macbooks? And also Should i spring the extra couple hundred for the unibody? Either i get the white or the uni and i plan to upgrade the ram either way eventually, so is there any advantage other than looks?
Having owned both, I highly recommend the Unibody. The case is a lot more sturdy and feels like a higher quality product overall. Even just closing the lid on the UMB feels so much nicer due to the gasket around the screen which makes a very solid and pleasing sound.
The aluminum doesn't pick up the microscratches like the white MB does. You do have to worry more if you drop or bang the UMB into something though as you'll get nicks and bends in the case easier.
Other things I really dislike about the white MB are its propensity to become discolored, the cracking issue which will eventually cause cracks or even parts of the top case to break off where the magnets hit on the top case when you close your laptop.
I also like the glass screen more and think the overall black on silver styling is better than the mono colored white MB.
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On the technical side of things these are the differences:
White MB advantages over UMB:
White MB has a FireWire 400 port. Unless you already have FireWire I wouldn't even care about this.
UMB advantages over White MB
UMB uses faster RAM - DDR3 vs. DDR2
Glass trackpad - I really love the gestures, makes things much easier
Mini-DisplayPort - more future proof than the Mini-DVI on the white MB