To be honest I didn't even think of the STI because of the addition gadgets involved. I thought the WRX gauge cluster would be a pretty simple swap though. Reading over the above link I have some concerns about the mileage being reset as I don't want to do any irreversable damage to what is an otherwise good setup.
But I do appreciate the info from infulleffect. It at least gave me an idea of what I should be looking at as far as installation, cost and possible problems, so thanks much.
Anyone else have any ideas?