Man you are going to love that hike. I've hiked that loop like 6 times and it's one of my favorites in the Sierras. It's really a nice intro hike for newbies and the scenery is just spectacular. I'm not sure how long you are planning on taking but I imagine you could easily do it in 2 solid days or 3 chill days, I did it once as a marathon 1-day hike, but I only brought water and a bunch of peanut butter.
BTW very nice gear list! Sucks you have to bring a bear can. They DO have bear lockers at all the popular campsites. Personally, I bring a bear-bag (the ursack, don't remember weight, but it's probably about 12 oz) although it's not allowed.. are you bringing the bug-tent part of the GW cape? I have done this hike in August and I don't think the mosquitoes will be too bad, by Sep. they are all but gone.
If you have any other questions or need a ride or anything call me, my number is 559-903-8091.