I too bought a D90 some 6 months back. I was initially going to buy a Canon (40D/50D) but selected Nikon D90 over it mainly due to the poor service of Metropolitan, the local agents and secondly due to brand loyalty. I earlier ('bout 5yrs back) used Nikon FM10 and FM2 which I was extremely happy with.
I am still happy with my D90, but feel a bit out of the place only beause most of the guys are using Canons. As I am informed, the reputation of Canon camera mainly derives from the superb performance of Canon L series lenses which are very high in price in SL.
I was not going to buy a pricey L series. The choice I had was to go for Sigma 170-500 for birds. This tele-zoomer is available both in Canon and Nikon mounts and I luckily found used one for a not so heavy budget from Ajantha at phototechnica at Liberty Plaza. Actually Ajantha promised me to find me a 170-500 soon, when I purchased the D90 and within 1 month he delivered the promise (not the lens, I had to go there to collect it
I can recommend Ajantha for good and reliable service. He seems to have a lot of contact among photographic community and directed me some other good lenses too though I was unable to afford.
This is if you are really concerned about the warranty as I did. But a lot of guys seem to use second hand stuff and stuff brought in from foreign countries with out warranty and use them with out any problem. I know some guys who practice photography as a profession, invested there hard earned bucks on DSRS without warranty and still doing well. It seems Digital SLRs are lot more sturdy than we think. The prices are considerably lower than those with warranty.
So think over all of these and make your decision.
Wish you will find a good DSLR and give us a good set of images to enjoy.