What you've got will work, but I'd consider a few things before pulling the trigger on that purchase.
What's in the Hoya filter kit? Consider the number, type, and quality of filters you get for the price. If the only lens I was going to buy with your kit was, uh, the kit, I'd look around for a $20-25 (new, used could be cheaper) UV, and a $30-35 circular polarizer.
Do a quick google on Mack warranties. The general discussion of extended warranties could go on for days; you'll find some who say "absolutely not", some "absolutely", and some "maybe." My general feeling on the Mack specifically is save your money, but otherwise, I'm a maybe. (Too many years as a Best Buy employee, and my fair share of service plans
).
That said, the tripod is iffy. A max load of just over 2 lbs, and a non-interchangeable head just doesn't give you much room to grow. It will work with the kit set up you're looking at, but I'd wager that you'll need something better if you get a longer, heavier, faster lens. Depending on the type of photography you want to do, you might be able to and be better off waiting and purchasing a mid-level tripod rather than an entry level.
The camera is good, the bag is probably good (I like Lowepro). Teleconverters basically multiply the focal length of any lens attached to them by a certain factor (most commonly: 1.4, 1.7, 2.0). They are very small and lightweight but have their own drawbacks. Usage depends on what you want to photograph.