@smoke4twenty
The D3000 would be great para sa budget mo. May assistance sa menus, so you can quickly familiarize yourself with basic DLSR functions. Very 'basic' body siya, kaya at least malalaman mo later on kung anong features ang talagang kailangan mo when you decide to upgrade. (I use one) But by all means, kung kaya mo din naman mag-D90, yun na.
@doremi: Kung maka-Nikon ka naman to start with, stay with what you've already tried. (I know, medyo biased ako. Nikon user din ako. Haha.)