I know SRAM X9's are MTB hubs, but for £150 could these be that much of a bad idea?
X9 hubs are 'OK' - they are reliable. They don't have the best pick-up despite being MTB hubs and they have a weird design that makes pre-load adjustment difficult. The freehubs are steel though and can be replaced.
Like @Brookly_Bay I have (well, soon will have) a Croix de Fer and I'm after some fairly light, tubeless ready disc wheels with wider (25mm+) rims.
I'd prefer hand built really and am thinking about Pacenti SL25's or CL25's and Novatec hubs.
But this groupset on Planet X is stupidly cheap and has the CL25 rims:
http://www.planetx.co.uk/i/q/WBPACL25X9/pacenti-cl25-32-hole-rims-on-sram-x9-hubs
I know SRAM X9's are MTB hubs, but for £150 could these be that much of a bad idea?