Sounds like a very good list. My fiancee and I will actually be hiking the trail the last week of August. Our lists are very similar with a few changes that many would call personal taste. Regardless, here's my insights...
You've got plenty of insulation with the MB, however I would consider a warmer pant layer than the EW4. My significant other was cold in her's last year and I've found some much warmer Mammuts for about the same weight.
We do neoprene socks around camp. Not quite as warm as the goosedown, but if you have wet conditions it provides a little more versatility.
We used a stripen last year and the JMT and hated it. You can only purify 1 liter at a time, you need backup batteries, ours had a few minor malfunctions which didn't seem so minor when we were trying to get water and outrun a storm, and you have to worry about dropping it and crushing it with you pack or a clumsy step. This year we are going with a Sawyer Squeeze, fast-fill platy set-up, and two smart water bottles. The SS fits on the SW bottle and you could very easily scoop and drink right from the filter mounted on the bottle or filter water into another bottle. I"m bringing the platys to play with them moreso than anything else.
Have fun out there!