The 55 series has as much technology as a NASA rocket
Huh Air preload and adjustable rebound is NASA technology now. 😉
Air preload isn’t that bad (had similar thing on my 2007 XC500), as with the coil spring and air You run the fork with lower pressure in positive chamber than in a air only fork. Works well for heavier riders.
I would probably wait till 2010 lineup of Marzocchi as 2007 and 2008 models had some problems especially the fancy ones with air ATA, Doppio Air etc
You could do as Si said but again if the fork will be in the service than what will You ride then? Maybe some NOS 2005 or 2006 forks? My friend got a pair of mint 2006 66SL for £147 off eBay and You can adjust the travel between 160 and 180 by negative chamber pressure.