Forgot to mention, stay with the 110 option it suits the bike better, I have ridden ones with the 120 and found it slowed the steering and I just did not like it.
Usually it is not wise to mix different manufactures or totally different tyres types, but the PR3 and Pr4 are really from the same stable and I know a few who have gone with the Pr3 front Pr4 rear and find it a good combination.
The Sportec M7s are probably more expensive than the Pr3 Pr4 combination. If you do go that M7 route the tyre profile makes for very quick turn in, but I have found they are very stable with good feel.
Usually it is not wise to mix different manufactures or totally different tyres types, but the PR3 and Pr4 are really from the same stable and I know a few who have gone with the Pr3 front Pr4 rear and find it a good combination.
The Sportec M7s are probably more expensive than the Pr3 Pr4 combination. If you do go that M7 route the tyre profile makes for very quick turn in, but I have found they are very stable with good feel.