Same Here even higher winds than 70-80mph ...but do'nt buy absolute crap even IF money is an issue its just not a worthwhile idea .
buy a New Technomate TM 2600 H-H Disecq Motor
you will get it for around £42 - £45
or €64 its not hard to find one brand new for that price ,
to be honest you wont find anyone saying anything negative about this motor it really is a genuine good reliable motor and built to last years of poor weather and will drive your dish around for many a year im certain of that .
Good luck : )