If your objective is to eventually go commercial, then I'd seriously look at doing your JAR PPL straight off, in the long run it'll save you a lot of money.
Tailwheel time will only make you a better pilot: the transition from tailwheel to nosewheel is trivial, the reverse can take more time, money and effort.
If you can do your PPL in a Super Cub, do - it's a great aeroplane and you'll learn loads. Somewhere en-route to your CPL you'll have to fly more complex nosegear & retract aeroplanes anyhow; but, the skills learned in the Cub will stand you in excellent stead, and give you no real penalties.
G