You can get an uprated clutch and new DMF fitted for £1k or so from AKS Tuning so £1200 is a rip off for just a DMF!!
Take it to a specialist who won't charge you the earth. Yes, change the clutch whilst the DMF is being replaced - false economy not to.
By the way a standard DMF, clutch kit, slave and bolts can be had new for around £350 for genuine LUK items delivered from Carparts4less (where I bought mine). All of that can easily be changed by a garage in around 4 hours (Done it myself - 2 of us in a garage took two hours)