Spend the extra and get a Kipor, the yellow ones that most have, no need for mixing oil as it just runs off unleaded fuel.
What are you going to power off it? if your going to use electrical things like computers I think the sine wave ones are better.
I got mine from
http://www.dpgenerators.co.uk/price_...sts/kipor.html
I would steer clear of the noisy 2 strokes!