To the TS,
no point dragging this lah k...you mentioned you like Nikon, so go on ahead and find one that suits your budget. $800 sounds about right for a brand new Nikon D40 with kit lens (18-55mm) but u can call up camera shops to give u a quote so u can try get the best price. Or else, maybe you can get a second hand Nikon from one of the nice CSers in the buy/sell section.
READ UP, do your research and don't be lazy. there's a wealth of information on the www and in clubsnap itself, provided you are serious about learning lah. owning a DSLR also requires you to work harder, you know. you'll need to read up more, shoot more, experiment with the different settings and even go for courses if possible.
all the best.