Crazymama,
I'm with Warren on the sleeping bag. I would look for a 20 F down sleeping bag. A 45 F bag is only going to suffice in perhaps July and August. If you do any camping before or after those months, I really think you'll wish you had a 20 F bag. Additionally, the bulk of the weight in a down bag is in the nylon shell, baffles, etc. used to contain the down. A 45 F bag will usually only weigh a few ounces less than a comparable 20 F bag. Some would argue that a few ounces is very significant, and I would agree with them, but only under certain conditions. If the majority of your Adirondack trips will be setting up base camps, and then doing day hikes from there, I don't think the few ounces is all that significant. On the other hand, if you're going to be carrying you full pack over the Great Range Trail, then those ounces become significnat.
The EMS Mountainlight 20 F bag (725 fill, 2 lb) is a good value at $199, and packs down to the size of a football.
Regarding the pack, I'm with Warren on that one too. Providing your winter pack is in the neighborhood of 3,000 cubic inches, it should suffice for May through September backpacking trips in the Adirondacks. If you decide you want a new pack anyway, I would definitely select a pack under 4 lbs, and even better 3 lbs or less.
I really like the Gregory Z-Pack (2 lb, 14 oz for a small) at $169 for 3-season use. It's a fully featured pack with a nice suspension system, and enough pockets to keep things organized. I'm sure there are other good choices in this category as well, I'm just not as familiar with them.
John