Well, the XTR v's are great for the most part, they're easily powerful enough. For 3/4 of the 16km trail on Sunday they were great, could even get away with one finger braking if I needed. As all rim brakes suffer from though, after 14km of heavy use, with a mix of brake dust, mud and water coating the rim, they turned to s**t. I'm planning on some much longer rides in the future, after 30+km in similar conditions they would become a serious burden.
I used to run some Blue Maguras on the bike I owned years ago. Back then they were awesome, but I was never keen on the look or their bulkiness etc.
Regarding the cost, I'll be buildings a new front wheel at some point anyway. Only difference will be if I lace in a disc or non disc Hope suspension Ti hub. If my XTR lever works with the Avid BB7, then the disc and calliper costs another £50. The forks are the major cost, but the steerer on the SID's I'm running now is a tad short, so they could also do with being replaced (or can the steerer be replaced?). Sure I could sell off the stuff I have now at reasonable price, wheel ~ £20, SID's ~ £60 (need new seals) and XTR v-brake ~ £20.
New SIDs will cost ~ £80-100. New wheel ~ £20-30 for hub, £20 for spokes? New disc + calliper = £50. So It'll cost me £80-100 after selling existing kit, although the £40-50 for a new wheel will be spent no matter. New SIDs might also be a necessity.
I'll see how things go next weekend first.