D40 is fantastic, but bear in mine photography can (most likely will) be an expensive hobby.. soon you start to crave insane lenses that cost £800 upwards.
However, and this is true, if you have a natural talen for it (once you learn the ropes), then you should be able to take great photos with any old crap to be honest. I like to read
www.kenrockwell.com - he's fairly honest about stuff.. Otherwise there are some nice guides on
www.photo.net