Mate this thread is massive and you've probably already decided. So many people have already Given some fantastic advice.
I've had a 2piece alpinestars suit for about 8years. I've got 2 jackets that both zip to the trousers. I've been very impressed with them. Earlier this year I treated myself though to a one piece arlen ness suit when I got the RSV. OMG! it is fantastic. Quality,fit,support, it's all there. It is a kangaroo leather suit with the flash titanium bits in it. Was over a grand at the shop, browsed eBay found 3 on there. Got mine from a nice chap on Scotland, paid £600 and it's like brand new. Not a mark on it as it was only 6month old. Definately worth browsing eBay. But don't forget to look at some dealer websites given the jan sales etc.