My .02...avoid the kits if they include glass carboys. You'll eventually want to get rid of them for something safer. If I look at what I use now to brew extract it's a pretty short list.
-Burner (use and love the Blichmann, there are cheaper ones out there)
-10 gallon pot (I'd consider getting a pot with a valve on it going forward)
-Speidel plastic fermenter (30L)
-Big funnel
-Thermapen!
-Starsan/ spray bottle
That's it...that will get you through the brewing process! After this I would get bottles (22 oz. mean less filling), caps, a bottle capper, and some silicon tubing with a bottle filler.
Of course, I could be missing some stuff...it's been a hot summer and I'm not thinking straight.