Nobody will recommend jumping straight onto a Rotary. It's so simple to destroy the clear coat and burn/strike through.
Ive posted a offer on here before.
I have this DA and its pretty much the best you'll get for your money:
DAS-6 PRO Dual Action Polisher - Clean Your Car
use discount code: DAS6GROUPBUY
This will allow you to buy it for £99.95 delivered!