How come the max cc you can have for a year is 125? It's only the CBT that restricts you to 125, once you get your full license you can ride anything up to 33bhp, or anything at all if your over 21 and do the DAS.
In terms of which 125, go to a dealer and find the one that you are most comfortable on. When it comes to a 125, and it's your first bike I would say forget looks, forget speed. All you should worry about is comfort, weight and budget.
Forget the looks because to be honest unless your going to spend silly money it's never gonna look quite as nice as it's bigger brother (like the R125 next to the R6).... That and it's more than likely that your gonna drop it.... more than once, and if your not worried about the looks then as long as it still works then it won't be a problem.
Forget speed because.... well untill you have experience and bike control (which the CBT does not teach you), it's not gonna help you learn. And all 125s pretty much move as quick as each other apart from the 2-stroke power machines which are high maintenance, usually pricey and generally not great to learn on.
If you find them comfortable then I would really recomment the dual sport/offroad bikes. They are light, easy to throw about with a bit of confidence and skill. They are pretty much indistructable and are built to be dropped - the most you'll usually get is a bent Â£15 lever as opposed to a smashed Â£300 fairing. And they are FUN. You will always learn better when your having fun as opposed to when your nervous.
Life is too short for traffic. ~ Dan Bellack