I need to change to Canon/Nikon/Pentax/Sony to get a Sigma 10-20mm. I've got an Olympus E-330. There IS a whole bunch of 4/3 lenses, but some of them cost crazy money and there is deffo not as much choice as owning a Canon or Nikon. I was watching the new consumer model releases from both companies closely, as it's likely to be one of these I'd go for. (I do see official refurb 400D kits go cheap tho)...