Depends on your budget. The canon eos 1000 kit with the 18-55mm lens comes in at about £400. Good bit of kit for beginners. Not really heard about the 20 or 350, so can't comment on those. I love the resolution and speed of my 1000d....BUT beware, all DSLR's can get expensive with additional lenses and filters. if you want a half decent wide angle lens, it can cost anywhere of £300+, and they will only fit one type of camera (I.E canon lenses will not fit a Nikon camera and vice versa (I had various lenses from an old film SLR, but would not fit the canon

) ) I'd also advise looking at a high speed memory card (Sandisk Ultra II for a minimum, if possible the extreme III) for whatever camera you get, the quicker the better and more chance of getting 3 frames/sec in RAW format.
Sorry if that's put the cat amongst the pigeons, but it's something to think about, If I can help further, give me a nudge