I think you would be happy with an EPS 350-D or C gear and either E-tech 1200 or Thunder power 830 mah batteries if you like Lipo's or the Kan 650's would also work. This would keep your flight time up, while still keeping the plane nice and light. As mentioned before, it's nice to have a little power to get you out of a bad situation, and eventually you will find yourself looking for more power to carry out your aerobatics. You can re-time your 350 motor for more power( a no cost deal) if you feel the need for speed. You'll need some basic tools to build your Dandy Sport and some evenings as well, but I think that building is half the fun of this hobby. You always learn something new.
( www.aeromicro.com ) has a pretty good price on the GWS power systems and the batteries too.