Thanks for all the input already, guys! I've looked at every single suggestion so far!

I have always seemed to favor the thinner profile too and definitely NOT a quad rail type style. Several of my rifles have Samson Evolution or Midwest Industries Lightweight models, but I don't want to just be a creature of habit and keep using the same stuff when there's so much out there I haven't seen or used yet. Carbon Fiber has of course crossed my mind... I think Hoser's idea of a PRI Carbon is high up on my list. It looks similar to the Coda Evolution carbon forend I've seen previously too.

One thing I should probably keep in mind is the fact it's going to be used on a 16" barrel with a midlength gas system, but running an Adams Arms piston system instead... at least for a little while to see if I like it/notice a big difference when running suppressed. I'm hoping to keep gasses from coming back into the upper and in my face, so having access to the adjustable gas block, even if only through the holes in the rail, is a must...