I don't have a 136" yet, but I picked up a pair of extensions to stretch my sc-II to a 136" in the off season. Have you checked out the price on an m-10? When I have seen them for sale they were real pricey, have heard good things about them. Not enough to get me off the $'s for it. There's a opinion for ya!
It depends on what kind of ride you want. The M-10 will give you an awsome ride, many adjustment options, but no weight transfer. The Sc 10 will give a good ride, better wight transfer. If you are not racing, and can afford it, go for the M-10!!!!!
I have an M-10 on my 00' Mach Z and it is night and day differance from the SC 10.
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