Is it fine for a newbie to use semi prof DSLR?

Confused whether to buy a beginner model, or semi prof right away.(Canon 650D, Nikon D5100, or Nikon D7000)

If you're serious about photography and are absolutely certain that you won't just give up in a few weeks then spending the extra money of a better camera makes more sense. You'll soon use to learn all of its functions and you'll be pleased that you have a professional piece of equipment.

Here's a thought for you, the biggest cost of taking up photography is time! Many people see taking a photograph as an instant "press of a button" moment, but reality is far from that. Sure there are occasions when an opportunity simply presents itself to you, but those are few and far between. The rest of the time you will need to prepare, look for opportunities, or even create them. I would start with a consumer oriented camera and use that to learn what you are doing, spending anything extra maybe on a lens in a couple of months, or a couple of day long training courses. When the time comes to move up, it just means you have a spare camera body to play with.

Why do't you get the Nikon D3200? I think it will serve you well and when you are ready you can step up to something more expensive. Camera bodies evolve quickly and when you are ready to get a new body get the latest one.

Yes. But you haven't really listed semi-pro models.

The 650D is a slightly more advanced entry-level model, the semi-pro would be the 60D. I can't keep track of the Nikon models myself, but the D5100 would be the equivilent of the Canon 650D. If you try them you'll see the difference in usability. The semi-pro models usually have twin control dials which makes setting the exposure much easier in the PASM modes. I'd recommend the semi-pro models because of this to any beginner that wants to learn about photography. If you just want to take pictures and will largely use the automatic modes, then any camera will do.

You could also consider a used Canon 40D, it's an older model but has the semi-pro build quality and ergonomics.