Hello mate, hopefully you can get a deal sorted on a Pirelli, I love mine and there's plenty more power/handling potential in the car to come. I got a brand new un-reg Pirelli 2-ish months ago, lower spec than your 1st choice car, but I got 11% off list price offered v.quickly and took it, so it's worth pushing for the right deal as there are still these un-reg 'old model' ;) cars lurking in VW dealer stock!
Am sure the RS is awesome to drive but, having seen one on the road today, it looks pretty chavvy. Although at the time I was tailgating my old Mk 4 R32 Golf, which I haven't seen since the day I part ex'd it 5 years ago, and so the RS only got a fleeting glance!