Hi, it was myself you talked to on the Phone at tartybikes. I think you pretty much got the jist of it, however I would recommend the Shimano XT over the XTR brakes as they are thinner (same as LX), the linkage system on the XTR brakes can work loose and rattle over time also. I have run vee brakes on a 46mm rim with 100mm spacing in the past, I had shimano LX brakes with Plaz CRV backings. It cleared pretty well, but thinner pads would make it easier to set up. I know you mentioned a magura on the phone, but with you having vee brake posts, you would have to run Magura's EVO 2 adaptor to run the brake. This makes the brake much harder to set up and as I said on the phone takes up a bit of space too. As long as you set up a vee brake well with good pads and cable (BMX linear slick cables are good, or if you want bulk, as your local bike shop for shimano sp5 5mm gear outer in 15m length) it should work as well (or better) than a magura.. I had a vee on when I won a round of the world championships, so they are perfectly good. I would also recommend a booster to make sure your're getting the most from the brake. Cheers Ali