Alright since you are asking I will go through this and state how I feel. Keep in mind this is just me and everyone's style and needs is different.
6 Gallon Glass Carboy Fermenter complete with Stopper, Airlock, Carrying Handle, and Stick-on Thermometer.
5 Gallon Glass Carboy Fermenter complete with Stopper, Airlock, Carrying Handle, and Stick-on Thermometer.
Glass carboys are useful and will last forever as long as you don't drop them. I'd recommend better bottles for two reasons: they won't break and you can buy them with spigots! Spigots are nice imo. FYI I have 1 6g glass carboy and 2 5g glass carboys, I still use them if my better bottles are full.
Siphoning System featuring the "Auto-Siphon"
Auto-Siphon is cool works fine. I've had mine since the beginning but prefer not to siphon at all when I can help it. This goes back to why I recommend putting spigots on everything, avoid having to sanitize the diptube/autosiphon, (though you still have to santize the hosing so its not much of a huge improvement, just a preference).
Funnel
Don't really use this anymore since I am doing full boils and have spigots. Used it when doing partial boils. All in all I would probably recommend having one around incase you need to top off a partial boil or even full boil that you evaporated too much off of.
Bottling System with Bottle Filling Wand
2 Cases of 22oz Beer Bottles
Bottle Capper and Bottle Caps
Skip this and go with kegging.
20 Quart Stainless Steel Brewing Pot
Will not be useful since you'll need a bigger pot for full boils if doing all grain.
Boil Proof Brewing Spoon
Gotta have this or a mash paddle.
Floating Glass Thermometer
Never use mine, unnecessary. You will need some thermometer though. I recommend a good quality digital thermometer that can be calibrated. And a laboratory thermometer to calibrate it with.
Hydrometer and Testing Jar
Absolutely must have. They make "deluxe" precision hydrometers that are a little more expensive than the standard triple scale. I recommend getting a good one, itle be easier to read.
Carboy and Bottle Cleaning Brushes
Cleaning Kit containing PBW Cleaner and Star San Sanitizer
The brushes aren't really needed. Warm water, soak in oxyclean and rinse will pretty much get everything. If you have crud on the side you can stuff in a cloth and swirl it around, I found this easier than using the brush.
The cleaning kit looks pretty nice with the PBW and star san. You can live without the PBW if you opt for the cheaper oxyclean but you gotta have the star san.
"How To Brew" Book
Great resource. I advise you read it cover to cover. I also think it is a good idea to buy it to support the economy and blah blah blah etc. However the first edition can be accessed at www.howtobrew.com
In closing, before I get off my shoebox. I think you can buy just the items you need and leave out the more expensive things you won't use (bottling equip, and especially the kettle). You'll save a bit of money that can be used elsewhere.
EDIT: Oh yeah by the way after you buy kegging equipment and a bigger kettle you'll be going over what the cost of that kit is, but you'll be getting more for your money, IMO.