Personally I've never had problems mixing tyres, although now I tend to only mix different model types within the same brand ie Michelin PR3 rear pilot power 2 front (although this was on T,cat and Gixxer 750)
Haven't looked into what decent tyre there is these days for the fazer 110 front.
Btw I got 16000 miles out of the rear on the Gixxer and I didn't hang about on that, cracking tyre IMO!