Replaced the clutch and DMF on my 2.0 tdi yesterday. I bought the parts from a SEAT dealer who does mail order.
I did a lot of ringing about/searching online and got it at a very competitive price from David@SERE Motors in Belfast - happy I got a genuine VAG kit derived from my VIN with new flywheel bolts etc for a tad more than the cheapest eBay seller, but peace of mind included.
Seeing as you're new and can't PM, here is a way to contact him if you want a quote -
http://www.seatcupra.net/forums/forumdisplay.php?f=249Kit I got was Sachs, same as what came out. Problem being if you start mixing and matching brands they won't be compatible with each other. As far as I know, you'll have either LUK or Sachs so you'll ideally want to buy a complete set together as opposed to a clutch from here, flywheel from there.
Not sure if you've got any prices yet but they are not cheap!!