I was building from scratch ( well sort of….was an ex demo full build which i then “altered”) and went for the Sram.
XO1 cassette, was on the bike
XO1 rear mech, was on the bike
+ chain….
Swapped out the crank for XX1 (this is the only one with 76 bolt spacing for the 28 ring), also swapped out the shifter for twist grip, (can`t use triggers all day)
Got the crank from Aspire velotech 9in the states, and the front ring from CRC.
I tried to get it all from Aspire, but they had ran out of stock, it would have been roughly $1k, (approx £600)& you take a chance on import tax, even then it`s till miles cheaper….. 8)