To be honest, I'm enjoying getting back into SLR photography more than anything. The camera model wouldn't matter so much and, if I'd wanted more equipment then I could have gone for a D80 twin lens deal. I'd looked at lots of reviews and test images but I'd always wanted a Nikon - I had Pentax film cameras and they were good enough for me. I recently went on a dive trip where all the serious underwater photographers were using Nikons and they felt really good to handle. A mate has a Nikon (not sure what model) and they seem affordable(ish).
I really like the D90 and spent the afternoon playing around getting used to it. But as I mention in another thread, it's not about the equipment for me, it's the pleasure and I'm seeing things I never noticed before. I thought from the test photos I saw that it wasn;t overly noisy at high ISO and I've always liked available light stuff. I'm happy with the performance so far.
There are some very confusing aspects about the various autofocus modes - I just need to figure out what they do and how to choose the right one - this is probably just a Nikon thing. Oh, and I need to look at the info in the viewfinder - I use AE mostly but forget from time to time to check the shutter speed that's allocated.
I think it's a brilliant camera. I'm very happy with my choice.
Don't go hanging any monkeys...