Stephen, I'll second the comments about Westcomb here -- absolutely top-notch kit. I've been replacing more and more of my Rab and Arcteryx bits with Westcomb and have no complaints.
For tops, the Shift LT is indeed the lightest NeoShell jacket option I'm aware of; Rab Myriad is likely next up the chain, but it's ~3oz heavier and probably suffers from Rab's narrow-shouldered cut. EMS makes a house-brand NeoShell Helix anorak that's 12oz; haven't seen it or tried it on, but historically their cuts and attention to detail are hit-or-miss.
For pants, the Rab Stretch Neo pants are probably your best option at ~17oz; well-reviewed at Cold Thistle and elsewhere. Rab makes a Fusion pant (Matrix softshell thighs, Neo calves) but they're a weird mix and are approaching 20oz.
I wish Westcomb would make a Neo pant. I have their eVent Cruiser LT pants which are heavy but bomber; I keep trying lighter options (Marmot Essence, Montane Minimus) and keep coming back to the Westcombs. The significant expansion of their line this season has me hopeful for a neoshell pant in the near future...