hi, ive got LCR which needs one new tyre, it has two new michelin pilot sport on the front and a pilot sport with 6mm tread on the other rear tyre, my question is should i replace the one worn tyre with a new michelin sport (£150) or would it be ok to put a single good year F1 on OR buy to new F1's for the rear, sorry i kno its a bit confusing but being a student i want the most cost effective soloution. thanks