Why would you need to shell out a load more than £600+£300 for lenses.
What are you keen on actually photographing (or maybe I shouldnt ask) usually the kit lens is good enough for most activities, however the D90 comes with a reasonable 18-105mm which I use a lot, but for portraits I have a 50mm Nikon F1.8 prime lens which is amazing for those static shots of the Fiancee! I have a small gallery of great portraits!
The D90 is a very capable mid range camera and I couldnt recommend it enough tbh.
Cheers
Tone