Popped into Uxbridge today and had a quick play with the D90. Was very impressed and sorely tempted to buy
Few things held me back. The thought prices will fall in Jan. The unwrapping on the day factor (no matter how much you agree its an early present, as the birthday comes closer your tempted to buy something else anyway

).
Anyway back to the camera. First impressions were excellent, even before holding it in my hand. Aesthetically the design but particularly the materials on the Nikon stood out. Perhaps this is just my subconcious reinforcing my choice. But the plastics and materials stood out instantly as I browsed the display waiting for an assistant.
Having got it in my hand I was suprised how manageable it felt. Coming from a compact I'd always perceived SLR's to be unwieldy and ergonomically "challenging".
It had the standard kit lens on it which was excellent, and the camera felt very well weighted with it on. The viewer was excellent. The large high-res display really has the wow factor when you first see it.
I also looked at the Sigma 18-200 and Nikon 70-300 lens, which still felt manageable. I hadn't taken a SD card (spur of moment decision to drop in), so didn't want to trouble the assistant with swapping glass etc. Also might go to a bigger store where they have the larger glass in stock.
The dilema the assistant did raise was my glass selection. I had settled on the kit lens plus a 70-300mm thanks to the advice here. And the balance the kit lens provides is really appealing. But the assistant suggested I consider a 18-200mm lens as the range it offers means I would have less need to swap lens out in the field.
So now I'm torn between the kit + 70-300mm (possibly hiring bigger if needed). Or the Body + 18-200mm and the Sigma 150-500mm/hiring a larger lens when needed.
Not to mention fighting the urge to buy it now

and do a second unwrap on my birthday