I'm getting ready to put together a new ML spinning outfit myself. I have 6# P-Line Fluoroclear on my ultralight rig, and I'm thinking about using 8# of the same on the ML rig. So far the fluoroclear has been great line; very limp and almost no memory.

I use 20# braid (P-Line) tied to 6# Yo-Zuri leader.  I fish my finesse rig a lot  

I'm in the minority here. I use 30lb. braid with 8lb. YoZuri leader. The braid is yellow and makes it easy to line watch.  I fish from a boat 90% of the time, so casting distance isn't a factor for me. Sensitivity is and is also a reason I go with heavier braid.  My rod of choice is an 7ft. Med. Fast rated for 8lb-14lb. mono, so it along with the reel handle that combination well.

I fish a Ned Rig a lot, enough to have a dedicated rod and reel for it, and I could never imagine trying to fish it on 30lb braid. Even 20lb, which I use on another rod for skipping docks, would be a pain to fish with. 10-15 braid with a lighter leader is going to perform better and still be plenty strong to do anything you need it to do on a ML spinning rod.