canon1100d

My sis want to buy a DSLR. need a semi prof. one, just for beginner's ! where can i get a fair and best deal (range 35 k-50k !). Also, tell me should go for Canon or Nikon? people told me about NikonD3100 , Canon600D, Canon1100D also a good lens with the camera, least- 18-105mm. I NEED IT...