IF you want to you can take a look at my threads in here and Santa cruz and shocks about the same subject.
Basicilly, I'm around 300-ish

Decided I wanted to upgrade my hardtail and ended finding a Magura asgard fork on ebay for $200. it's a ir fork but i will tell you held up to any abuse i threw at it.
I splurged and got a clean 04 SC bullit frame and was back to square one because the 100mm was to short for the bullit. After a lot of research, for the same reasons as you . I was recomeded a dual spring fork like the Marz 66rc2x with the air assist and like you was assured from Marz that it would hold up.
I ended up getting a Marz Jr T (Couldn't past up the deal($100.) I figured if it sucked I could always resell it and get my money back plus it was the end of the season and if I waited I coud get a 06 66 cheaper over the winter or into 07.
The JR T has dual heavy springs and standard oil. It works but i havn't done any really big hits( Not that I really do any "really big hits!

) but really agressive trail rides 1' to 2' drops and i go thru all the travel. I don't bottom out but I use it. Marz recomended that I add a little more oil (10/15cc) to stiffen it up but it's to dam cold out here to try it yet.
So good luck, it sucks. I wouldn't look at anything new yet from R/S they havn't released their heavy srpings and have no info on how "us" bigger riders will hold up plus all the R/S is a single sided spring set up and from the research I have done that just isn't going to cut it.