I really don't have any experience with the doo skid, other than in a doo. The renegades (136" skids) with rebuildable shocks are excellent, but I wouldn't recommend an SC10 III with non rebuilable HPG shocks, or you will be paying through the nose for replacements.
The ultimate Doo skid is the SC10 IV or V, out of a 440 race sled. They have the ultra expensive piggy back shocks and are infinitely adjustable. If you can find one for under $800 complete and in good shape, you would be lucky. I looked for a year before going with the AC Crossfire skid.
The Crossfire skid is the same basic skid as the new style Fcat but without the sliding arm in the Front. The sliding arm is ultimately what gives the Fcat a more "cush" ride than the Crossfire. The Crossfire skid is 100% better in everything (stutters, G-outs, and big bumps) than the Electronic Ohlins mono with Hygear internals and springs that it replaced on my sled. I would recommend the Sno Pro skid because of the rebuildable Fox Zero Pro shocks, and heavier springs, which works well with Yammi's big waist line. The crossfire skid works GREAT in just about everything. Going from a 121 to a 136, I struggled for a while getting enough ski pressure to rail like it used to with the mono. A set of C & A pro skis, made light work of that. Now I have a sled that rails like a 121 and has the ride of a cat.....And I didn't have to recessitate my wallet when I was done.
With the crossfire skids you have to watch which year you get also. Some years do not have the coupler or transfer blocks. Mine is an 06 with the transfer blocks. I can set it up for excellent, ski raising weight transfer, or flip over the blocks and the skid is fully coupled and rails in the turns, and flattens out any bump you throw at it......the SC10's III through V have this feature as well. Without the couplers the ski would be in the air all the time...
If your decision is to go with the Cat skid, I can help walk you through it, and I believe there is a guy on here that put a similar Cat skid in his RX1 , Fullback, I think is his screen name.....
If you ask nicely I would venture to bet Ahicks would help with set up as well. He helped me out many times during my install, and I couldn't be happier with the results....