Welcome and I hope Linux provides all you need
To answer your question Suse and Red Hat are relatively simple distro's to start out with they have the whole handholding thing sorted (I started on Red Hat 7.2). So try one out also Mandrake is very user friendly.
Choosing a distro that suits you is like trying on a pair of gloves, you keep trying them on until one fits and feels comfortable. However those that you mentioned are fine, just take the plunge and try what you want to if its not what you wanted try another.