I dont have any experience with those cameras but my suggestion is to either go with a Canon or Nikon. Nothing else.
Many proffesionals argue about which is best but the argument is usually between those two brands.
Personally I'm a Canon fan but I only SAW a Nikon never really owned one (besides one tiny 4mp which I hate)
Try this site
http://www.dpreview.com/
They have many reviews and basically everything you would need to know about any camera you can find it there. It would help you alot for making your decision.