KlugeAnnett

I can second that.

I would guess the following:
ATX 24pin: 250mm (sadly the minimum, I think 200mm would also be enough)
EPS 4+4: 250mm - 300mm depending on the location of the connector on the board
PCIE 6+2: also about 250mm?
 

I have a Markus for over 4 years now and I don't want another one.
If you sweat a lot this chair is just made for you. Nothing against the Racer chairs but I don't want a wet back after 1-2 hours of sitting.
 
Only problem:
The height adjust thing doesn't work properly anymore. Sometimes the chair will just go back to the lowest position (the gas srping is probably damaged) but the chair is almost 5 years old now and I use it a lot, this things can happen.
I will probably buy a new one in the next few weeks.