Looking for a Nikon D90 or Canon 40D

[jackyen_2000]

Hello guys,
I'm very new here. I'm looking for a Nikon D90 or Canon 40D (something in the mid-range level). I'm currently using Nikon D3000 and it works well for me but as I feel I've outgrown from the entry-level and I want to try something better. Anybody can give me suggest where I could find these camera in a good price?
Thanks!