You definitely need to get a different bag. Because there is the possibility of getting nasty weather during hunting season, I'd go with a synthetic bag rather than a down bag because down will not insulate when wet. IMO the best synthetic bag material in Polarguard Delta. As far which model to purchase, it kind of depends on when and where you will be hunting. If you're going to be high up in the mountains during late fall, a 0 degree bag would be nice. But if you're going to be hunting early fall or at lower elevations, a 15 degree bag will be more than enough. I personally have the North Face Snowshoe (0 degree rating with Polarguard Delta $190) and an older Sierra Designs bag (was rated for 25 degrees but is higher now due to heavy use, filled with Polarguard 3D). I really love the North Face bag, and highly recommend it. If you want a 15-20 degree bag, the North Face Cat's Meow is an excellent bag. It's the same as the Snowshoe with less fill and no draft collar.
Regardless of which bag you buy, store it in a large storage bag or better yet, leave it hanging up on the wall.
For a sleeping pad, I don't care much for self-inflating pads either. I like the foam pads. I have the Therm-A-Rest Ridgerest right now that works well, but I think I'll upgrade to the Therm-A-Rest Z-Lite this summer. It packs up a little smaller.
The tent you're looking at looks nice. I have the Sierra Designs Omega 3S, which is only slightly lighter, and I think it is a fine weight for backpacking. The fly and footprint pitch option is very nice if you're looking to shave weight and save space.
The MSR pocket rocket would be a good stove, but I'm partial to Brunton products so if I were in your shoes I'd get the Brunton Raptor if I wanted that style of stove. I kind of like the more expensive stoves that run off of a variety of fuels simply because white gas is dirt cheap and you could siphon gasoline/diesel out of your truck in a pinch. But you should be fine so long as you are sure to bring enough butane canisters.
Other little gadgets that I have and like: Brunton windproof butane lighter, Brunton lightweight backpacking cookware, Primus titanium (superlight) eating utensils, Brunton compass, Primus LED headlamp.
I plan on purchasing a new water purifier this summer, which is something every backpacker should have. I drink straight out of streams once I get above timberline where I can see where the streams start and no moss is growing.
Also, if you plan on eating the lightweight freeze-dried food, be careful about which ones you choose. Some of them taste like crap. I lived off the stuff for a week in the Alaskan wilderness and some of the entres tasted horrible. It's not much fun humping straight up and down mountains all day then having to eat bad tasting food for dinner.
One last thought- don't just limit your backpacking to hunting season! It makes for a great weekend adventure during the summer, and it keeps you in good shape. Not to mention the dynamite fishing spots you can get to high up in the mountains.