I gotta be completely honest here, but if you are 200lbs a superlight bike is just stupid. You can easily get away with something "midweight" I'm sure since you aren't like 250+, but a SID flexes under my 150lbs...
If you weigh more now and are more daring now, why would you even think of a superlight bike.... it will NEVER hold up. I would look at Marzocchi's and Fox's offerings--they tend to be much stiffer and more durable than the Rockshox. If weight is a big concern most of the Fox XC and some of their longer travel shocks weigh under 4.5lbs. My F80x is 3.6 with the steerer cut. Really, you are looking at adding 1-1.5lbs and gaining a ton of durability. I would kinda steer clear of air shocks in general and try to get a coil or something with a coil assist.