the ACE SOCOM is pretty nice.. as for a cheek weld solution, well there's the VLTOR's and a few others, but CAA makes a add odd stock saddle that is pretty light weight and so far has been remarkably durable. I've not slammed it around or anything but it hasn't been babied. Not to mention they are only about $18-24 depending on where you get it.

I've got a ACE SOCOM (L) I'd be willing to part with if you're interested It was mounted on my 20" AR until I snagged a MP PRS.