Well I finally had the chance to try some of the regs mentioned previously...
I did most of my diving with MK20s/S600/R390 - AL80s with Dive Rite manifold and Halcyon Explorer 40; everything apart from the second stages, SPG and hoses were borrowed. The MK20s were great - no problems; the hose routing was a little tight on the top part of the wing. I ended up having to use my Apeks FSR as a deco reg!
I also had the chance to play around with (but not dive) a pair of MK17s - did not like the hose routing at all... The LP hoses routed straight down and the HP hose came out at a weird angle. Sorry, did not have a camera, so no pics.
The people I was diving with were using Apeks FSTs and FSRs with assorted Apeks second stages (TX50/100s, ATX200s etc.) - the hose routing is very nice on the Apeks, especially on a wing like the Evolve where the long hose needs to be in front of the wing...
Anyway, I sold my one FSR and bought a pair of Apeks FSTs that the LDS sold to me at a good price...