“mostly X9 (shifters/mechs) and Race Face finishing kit”
They’re both way to pricey. Shimano XT ought to a cheaper equivalent. SLX is similar but slightly heavier (but more robust)
Raceface is all pretty pricey for the weight of the bits
Look around at each component spec (to see if the weight is alarming) and try to find them all cheap through Easton, FSA, Bontrager etc.. Hope/Thomson will be a fair bit more
“around £100 for a chainset and this would mean to me an SLX chainset”
SLX triple is 889g. XT triple is 853g (and about £40 more)
“brakes (around £150 budget) – the hubs are centrelock”
SLX are a little over £150, but should be far better than hayes stroker ryde or magura julies. Phone up merlin and ask them how much they’d do SLX brakes with centrelock rotors for? They’ve got a pair for £170 with 6-bolt ones
Elixir Rs seem to getting very good press too. Supposed to be more powerful than juicys but lighter than the 3,5 and 7