Hi i am new to SLR photography and i was wondering if the Canon EOS 400D would be a good first camera to go for, your help would be much appreciated, Paul.
Just bought a 350D and love it!! The 400D is a better camera, and it's cheaper than my 350D was. So I can't say enough about how good this camera is and I'm guessing you'd like the 400D even more than I like my 350D (and that's a lot!)
However I'd like to echo the other folks' statements about how you should go try it out and know what you want before dropping ~$1000 USD on a camera body and lens unless you know what's important to you, etc. What I can say in this regard is that the Nikon 80D is a comparable camera in terms of features, quality, and price, but it has a different feel to it that you might like better. The Olympus Evolt is worth a look and Fuji also makes comparable ~10MP DSLRs to check out.
I would like to add one last (and more important) remark. Over the years you'll expect to upgrade your camera body a few times, but you'd be better off
not buying new lenses every time. So... if you invest in a DSLR make a choice that's a bit beyond the camera itself... what camera has a lens selection and an overall SYSTEM you like? In the end you might find that if you're a serious amateur/enthusiast, the price of the camera and its features are quite insignificant over the long haul relative to the cost of good lenses and how much impact the lenses have on the quality of your photos.
That's what made me go with Canon's DSLRs. However other folks tend to feel that Nikon is a better camera and a better system to buy into. That's fine, in the end they're making a personal decision that suits them and there's nothing wrong with it, but do make sure you think about that when you decide.
When you buy a DSLR, also think about what sensor size you want. If you don't mind the EF-S size, there is no reason to NOT get an entry level Canon or Nikon DSLR. However pros and more serious photographers like the EF (full size) sensors and thus they're willing to drop a LOT more money on those systems. Lenses aren't from interchangable (in one direction... you can put an EF lens on and EF-S camera but not the other way aroud) so some folks decide they will buy an EF-S camera but they NEVER buy EF-S-ONLY lenses in case they upgrade to an EF body at some point. This is problematic at times since the EF lenses don't make good wide angle lenses when used on EF-S cameras due to the different crop factors (1x for EF, 1.6x for EF-S (canon style) or 1.5x (nikon style)).
Hope this is helpful.