I'm getting the Ultimate edition OEM, I figure for the price it's worth it, plus I’m going to put it on my laptop. I’m not likely to ever change motherboard on that, so it would be pointless to for me to get the retail.
However I’ll probably upgrade my PC to Vista as well at some point, as this is my primary gaming rig, I’ll have to go retail as it will get a motherboard upgrade at some point, I’ll be getting the Vista Home Premium Retail Edition though.
The price of Vista Retail is the major flaw in my opinion. I mean who the hell is gonna pay for £300 and something for an OS