If you've never used a SLR before your best bet is to go for an entry level SLR like the Canon Rebel or Nikon D90.
Your pictures wont be any better with a higher model camera. Especially if you have never used an SLR before. The higher models are better used in manual and that takes alot of practice and learning all of which is easily accomplished on the entry level series.
The photos those 2 cameras i listed will take STUNNING photos, but once again until you learn how to use them. There alot of learning right there on its own, nevermind taking a step up to a semi-professional. Theres no need to shell out that much money yet
Canon is great as you can usually pick up a slightly older model with lenses suppper cheap when a store has a sale. Since they bring out new models so often with the rebel series. You can get the body and usually 2 lenses for under $1000 and you will be able to take some AMAZING photos once you learn how. Honestly no need to get one of the more expensive ones, save up for one of those a few years down the road.
Personally I would go for Canon, all my equipment is canon, and needles to say I am not a delicate person and my stuff gets trashed. Both my rebel and Powershoot have withstood the tests of time, floor, sand, water.... the list goes on.