Keep your eye on ebay.
Quite a few brand new sets have come up for £1400-1600 with tyres.
Someone on here bought them and decided against using them a few months back.
These are the ones from on here. I'm sure the seller sold them on for what he paid without profiteering.
http://www.ebay.co.uk/itm/BMW-Perfor...#ht_500wt_1156