I'd recommend the 312mm set-up. Big improvement for such an easy mod.
You only need the discs & carriers - You use your existing calipers & pads (unless your putting on brand new 312 discs, which would mean you should put brand new pads on, too).
If you want to keep the 288 set-up, then just buy some decent pads such as some Ferodo DS2500's....... But then, they should be decent for the £125 the front set costs!!!
Ps Don't be fooled into buying some over-priced, fancy grooved/drilled discs, BTW - Just get some good old cheap, plain, vented Brembo's or the like, from places like GSF etc.