For tents, there are a lot of great choices. Mountain Hardware, NorthFace, Bibler, GoLite, Marmot, Big Agnes, Black Diamond. I used to do a lot of mountaineering and extended back country ski trips, when I lived in Alaska. I used a Mountain Hardware Trango for most of the time, but it was heavy. I'd split the load with a buddy. I used an Outdoor Research bivy sack a lot, too.
For sleeping bags, Western Mountaineering and Feathered Friends make some of the tops. I've got a Feathered Friends bag with 800 fill and Goretex. I've used it in soaking conditions in Southeast Alaska and never got wet.
One thing to definitely splurge on is your sleeping pad. I'd rather pack an extra 2 pounds of thick sleeping pad, than go with a thinnner one. A good nights sleep more than makes up for the extra weight. You'll also sleep a lot warmer.