There are many different options for your to contend with. Let me start with sleeping bags.
You'll probably want a down sleeping bag as they compress well and are very light. You will obviously pay a premium for these but, in my opinon, they are very much worth it. Western Mountaineering and Montbell come to mind. Some people here will recommend quilts whereas others will recommend straight bags. That's really a personal decision: whatever you're most comfortable with.
If you do go with a bag, try and get one with continuous baffles that is rated for a slightly higher temperature than you need (ex: -10 degrees if you need a -15). The reason for this is that you can shift the down from your bag from the bottom (the part you sleep on) to the top, raising the effective insulation. Moreover, these are lighter. :) You can always wear an extra shirt or sweater to bed.
As for tents you have, again, many options. I rather like double-wall tents as they tend to have less condensation that single wall tents but have more privacy than tarps. Bivies are also an option if you're going to be sleeping by yourself, and they are much lighter, but rule out any kind of partner camping. MSR, Big Agnes, Mountain Hardware, The North Face and Sierra Design all have good models.
Your backpack is similar to mine (Bora 80) and is darn near bulletproof. That being said, it's also heavy as lead. It carries weight like none other though, so I think you might get away with it if you have the rest of your gear light. If you want to go light with your backpack too, it's a trickier question. You need to make sure that all your gear fits inside, even more if you go frameless. GoLite has a good lineup.
I could go one, but there are more knowledgable people around here. :) Hope this helps. Remember, YMMV, and most importantly, pick what you like and will enjoy.