What camera should I buy?
My answer to this comes in two questions:
- “How much is your budget?”
- “What kind of photography do you want to get into?”
First things first: How much is your budget?
Photography is an expensive hobby.
I remember the feeling of handing over my Christmas bonus just to buy my shiny new DSLR; it was like reeling from a punch in the gut and seeing clearly for the first time. 
Depending on how serious you want to be with this hobby, you’ll probably be shelling out some serious cash even after you get your first DSLR. If you’re like me, you’ll buy lenses, camera bags, strobe flashes, photography books, photography magazines, diffusers, studio lights, more lenses, etc. The more you grow with this hobby, the more tools you may want to get to manifest your photographic vision.
As much as possible, get a brand new DSLR even if a second-hand camera is an option. A camera is a delicate instrument so it’s better if it comes with a warranty. (Plus you’ll love that fresh camera smell… :D)
For the financial sanity of your girlfriend/wife/loved ones, plan how much you’re willing to spend on a DSLR in the short term, then double (or triple) that allocated budget over the next few months. In my experience, that’s a realistic budget for a beginner’s photography purchases.
And if you don’t believe me, feel free to test this out for yourself by jotting down every photography related expense you make in your first year as a newbie photographer.
Of course, you can also try to exercise discipline and just say no to all the new photography gadgets that come along. Good luck with that. 
In a nutshell: Photography is expensive, so be responsible and make an honest budget before you buy your first DSLR or digicam. It sounds like a simplistic lesson, but it’s also practical.
