I'm debating the SAME thing right now. Pros for keeping it 275 all around is that tires are much cheaper because you have a much wider selection. Its also better for traction.
Cons is that 275 on the back wheel will look stretched. I found a pic online once of a E70 with this tire size on the back 20" wheel but can't seem to find it again. It didn't look horrible but it didn't look good either.
Alan
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