Pulsar 180cc Ug3 Tyre Change?

I hv a pulsar 180 ug3.My rear tyres are Tvs (100/90 -17) and they suck big time.it skids a lot. I wana change to better tyres with better grip.Please Help...i was thinking of increasing the size to 120/80 MRF zapper C..wt do u guys think ?