ajzammit

Hi all. I have a ybr125 of 2007, and have been riding for almost 3 months on a daily basis, commuting to work, etc... I try to avoid riding in rain, but using it daily means you get caught sometimes, and usually the roads are skiddy in the morning because of the dew. I still have the stock tyres on the bike, and was reading on the net that changing to some better brand will make a heck of a difference. So i just have a couple of questions I'de really appreciate if you could pop your suggestions. 1. Any particular brand known to be suitable for this bike. I was thinking Bridgestone. 2. the rear tyre is 90/90 18, while the fron is 2.75-18. Could it be possible to widen the tyres to have a greater contact patcth/grip. If yes, what's a better width... say 100/80 18? thank you all for your help. cheers