Nikon vs canon vs sony?

Sony DSLR-A390Y
Nikon d3100
Canon 1100d
looking for entry level dslr, witch one?
any more suggestions?
Added (1). Also pentax k.r

It depends upon which brand you want to be married to for the next few decades.
It seems that Sony is leaving the dSLR arena and are moving into the EVIL and smaller type fully adjustable cameras with interchangeable lenses.
Nikon and Canon are the two most popular dSLR brands and account for the most cameras and lenses sold to professionals
Read this, take your time, take notes and then look at those three cameras again, armed with knowledge
http://bythom.com/2011predictions.htm
- Sony Nex 5 versus Sony Alpha A500, which takes better pics in simple shoot modes?
- Sony Nex C3 or Sony HX9V?
- Are sony slr cameras good? Is sony a good brand?
- Are 50mm lens of any company like nikon, canon or sony same in performance? Or nikon's 50mm are better?
- Which camera should i choose? (Nikon D5100, Canon 60D, Canon 600D, or Canon 650D)?