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Are you running 10 or 11 speed?
If 11 speed, the X9 only go up to 10 speed, not much choices in the MTB section unless you go for something like the Hope hubs whose freehub body can be changed for 11 speed (or go for a road/cx disc wheelset, like the Hunt, or Kinesis).
IMHO, the Crest/Hope wheelset is the best bang for weight and durability, especially on a featherweight such as yourself, min tyres I recommend is 28mm which look exactly a 23mm tyres on a wide road rims.
edscoble-
I'm still deciding as I've got a SRAM Force groupset I could reuse with TRP Hy/Rd's, but am tempted to treat myself to a new 105 groupset with RS685 hydro STI's and BR-RS785 calipers instead as this is the first new bike I've bought since 1996 and 105 is fantastic value.
I like Hope hubs and they've been good to me, so Crests on Pro 2 Evos sound good. It's a shame that Hope don't seem to make their £330 Hope Hoops version anymore but I have found the Crest 29er rims for £49 on sale.
They will be getting at least 28mm's, almost certainly bigger as the CdF takes up to 40mm tyres.
Fox
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?