Some CSers will tell you Sony is good, some will tell you Nikon is good and some may tell you others are better. So in the end, the choice is still yours. Why not go to the shop and test it out yourself ? Only yourself will know what you like best. Whether you have chosen Sony or Nikon or others, it will still take good pictures if you are good.
Some simple qns to ask yourself for choosing a DSLR:
1) Is the price affordable to me ?
2) Is the range of lenses available suitable for my type of photography ?
3) Is the body feel comfortable in my hand ?
4) The availability of accessories and their cost.
5) Do my peers own the same brand so that I can share lenses with them ?
6) Do you prefer Image Stabiliser on body or on lenses ?
7) Is high ISO performance important ?
8) Do I like the buttons layout and interface ?