We run a Ford C-MAX as the main family car on 215/50 R17 95W ContiSportContact 3s. I need to replace the fronts and noticed ContiSportContact 5s are marginally cheaper (£10 a tyre), quieter, more efficient and perform better in the wet.

Is it advisable to stick to the 3s all round or can I reasonably go with the 5s and eventually replace the rears with the same?

Also worth a mention, I use tyresonthedrive.com who are always on time, professional and priced very competitively. I highly recommend them.