please help.. Which Mac is best for me?

Hello, I am looking in to getting a Mac because my laptop with Jaws is dying on me. I've never tried Voiceover on a mac but have iphone etc. It appears to me that jaws has deteriated considerably since i first started using it. So i am looking in to the mac with voiceover. What i would use it for - i use the internet quite a lot - outlook and itunes (which is rubbish with jaws) I have no idea which one would be best for me Thank you very much for your help in advance.