It's like buying a boat or water craft in the summer, you will pay a premium. Now is probably the best time to buy, or at the end of the season. I wouldn't wait too much longer. However, there is always a deal to be had at anytime of year. It all depends on how long and how much you wait or look.
Just bought a float bag, hope I never need to use it. Air bags are similar to seat belts; they aren't guaranteed to save your life, but they will drastically increase you chance of survival.
My option is pretty one sided because I haven't tried any of the other clutch kits, but I put the rooster built in my XM and it made a huge difference, love the kit.