That tiller looks like a beast, have you used a tiller/Rotavator before?. They can give you a right good workout,what do you plan on using it for? There is a difference between a tiller and Rotavator the later is for breaking virgin/rough ground.
I was advised by a friend in the know to get one with a Honda engine as they start and lots of the others are a right sod to start, so got a Honda f220 off eBay its great easy to lift into the car and has got my 300m2 sorted