Which big items do you already have?
I live in Colorado and I use a Sil SoloMid, its a great shelter. But I think you could easily drop the half-pound InnerNet, bugs are usually never bad enough at elevation to warrant bringing it, but that's just me.
Maybe think about switching from esbit to a canister stove, there are pretty strict fire bans in place right now all over the state. Of course that could change for next spring/summer if we have a wet winter, but don't count on it unfortunately.
The Marmot Aegis is what I normally use as well in the shoulder seasons, but at over 13 ounces I'm looking for a lighter replacement for summertime. Rains will most likely be short lived and you won't hardly ever be hiking during inclement weather, so finding a PU laminated jacket would be worth losing breathe-ability and shaving another 8 or 9 ounces.
Lose the fleece pants, they will not be needed. Instead, bring a pair of lightweight long johns for camp lounging/sleeping. Wool or synthetic, whichever you prefer.
Also, toss the fleece jacket and get you hands on a light down jacket (or synthetic). So much warmer for the weight. And during the day, while moving, you won't really ever want/need to wear insulation, so wet performance is a non-issue.
You can drop the second pair of underwear (assuming you will be using synthetic compression shorts or the like?)
Whats the weight of the sil pack cover? You can just use a compactor trash bag inside the backpack. Easy, light, durable, cheap.
I always wear full length nylon pants above tree line. They will protect against the sun, and keep you remarkably warm for the weight. They also dry very quickly, and would negate the need for bringing the Rain Kilt.
There are much lighter quilts about than the MLD Spirit, you can save a lot of weight switching to down. Check out Enlightened Equipment, they probably have the best selection for the price, and it can be custom sized to you.
Anyway, let us know which big items you already have. Don't go wasting lots of money on only marginally better gear :P