Firstly, Henrik, get that overrated Yokomo rubbish off this thread!
Secondly, purchased a servo for the ZX-S. Went for a KO 2001 in the end. Great spec and good price.
Final electronics are as follows; Trinity Kinwald Epoxy motor, Novak Duster sport ESC, KO Propo PS 2001 steering servo & Sanyo 2400SCR NiMh saddle pack.
Boo ya!