The Sony A330 is very cheap because the ergonomics of that camera were horrible and they didn't sell well at all. The difference between the two is mostly the ergonomics, so you'll have to decide if you would be alright with the camera.
You say you might go pro, but if that's the case then plan on switching to Canon or Nikon later. Sony doesn't even offer an advanced amateur APS-C sensor camera. They discontinued the A700 at the beginning of the year and there has never been a replacement. Also, Canon and Nikon have a much wider variety of DSLR choices, accessories, lens, and a professional service, which Sony does not have. Sony release 7 cameras this year, all under $1000. That's where their emphasis is, not the higher end.
I am about to buy my first dSLR and after some time comparing and searching I found this two models that I really like: Sony a330 and Sony a350(almost at the same price but not new).
For now I will use it for taking travel pictures and some concert (low light) pictures.But thinking of advancing to more professional photo taking in the future.
So what do you think about this models?Is it a good pick or should I look for something else?
PS: My price range is the Sony a330 model so if any suggestions please keep this in mind.