I spoke very briefly with the guys at SJS last week, and it seems the Catalyst is no longer available in my size, in black - unless I pay to have one of the red or blue frames stripped and re-painted, which adds another £100 to the cost, and another 2-3wks wait on top of the 3wks build-time. That's a bit of a bummer. However, the chap I spoke to did mention the Stirling, due to be released in September, which (I think he said) will replace both the Enduro and Catalyst. As Hamish said, it sounds a bit like a Catalyst but with bosses for disk brakes. £300 cheaper than the Catalyst, because it's made from different steel.