If getting the 345mm setup have a look at ECP Pagid 340mm TTS discs, they are £46 each with discount and 2kg lighter than the R32 ones (as well as being cheaper) and come with treated bells so they haven't rusted yet.
Edit: should say that the 340mm discs were about £27 cheaper than 345mm discs from ECP last month - better discs and better value.
Could you post a link to these Pagid 340mm discs on ECP you mentioned?