Welcome to the forum.
I wouldn't start out thinking that you want a starter kit that won't need upgrading. I'd start with something that can get you started, but which you can add to later to increase capacity or brew different beers without making your starter kit redundant.
I think that http://www.austinhomebrew.com/product_info.php?cPath=178_33_52&products_id=11356 would be a good starting point, possibly with a few upgrades and a few additions.
You should be able to make good beer with that, and there's very little in it that will become redundant as you progress.
The 7.9g primary fermenter is a good size, and even if you switch to carboys later on, you can still use the bucket to have 2 or more brews in progress at a time. Besides which, buckets are incredibly useful for storing things in.
The bottling bucket is essential if you are going to bottle your beer, and if you later go to kegging, you will still need to bottle some brews (at least I do).
Airlocks are cheap, and I'd get a few extras.
Rather than getting a racking cane, I'd get an auto-siphon. It cost a bit more, but is much easier to use.
The bottle filler is also wonderful for bottling.
You don't need a thermometer at all for extract brewing, and the floating ones are useless for me because I can't read them without my glasses, and I can't read them with my glasses because they steam up.
I'd try to get a bench mounted bottle capper rather than the wing capper, and you'll need to get more bottle caps, cleaner, sanitizer etc.
In addition to what is in the kit, you will need a bunch of other stuff.
You will need some accurate scales for weighing hops, priming sugar etc.
Postal scales work well for this, but if you are going to do partial mash or all grain, then a good digital scale with a capacity of at least 10 lbs, and a resolution of 0.1 oz makes life much easier.
Then, you'll need a kettle to boil in. I can't remember what size you need for extract brews, but if you are going to go for full boils, or all grain, you'll need a kettle of about 9g or greater. As the normal kitchen stove can't handle a full boil, it may be worth while looking into propane powered turkey fryers which include a pot and a propane burner.
Just noticed, the kit does not include a hydrometer. You really should get this.
Hope this helps.