Take a look at his starter outfit while NB has a 20% off deal going.
Has the plastic wide mouth fermentors. Can still see the fermentation but is safer than standard glass carboys. I've read that the EVO2 glass fermentors are much thinner glass than the standard carboy. You will need to add one or two hydrometers. Standard hydrometer for OG and FG http://www.northernbrewer.com/lab-grade-hydrometer-1-000-1-070 and maybe a narrow range hydrometer just for FG http://www.northernbrewer.com/lad-grade-hydrometer-980-1-020
A bench capper such as the Super Agata is nice to use and speeds the bottling process. The wing capper with the kit can be kept for emergencies. http://www.northernbrewer.com/super-agata-bench-capper
Your 4 gallon kettle can work for partial boils of 2.5 gallons for the extract kits and small partial mash kits. You would need to be careful about boil overs though. I bought a 5.5 gallon clad bottom kettle at Walmart which also does major kitchen duties.
A lot of what you purchase depends on your budget and then your brewing facilities. Most kitchen stoves have a hard time bringing 4 gallons to a boil. You could buy a propane burner and move your brewing outside. You are limited by weather doing this. You can make great beer with extract kits doing a partial boil and brew inside no matter what the weather is.
I'm sure you will need more ideas. Ask any question that comes to mind.