As the above said I wont try and convince you to make a MLT but its cheaper and takes about 15 minutes on the floor to get it put together
. That said I would also urge you to buy or make a wort chiller and pick up a solid paddle or something sturdy and easily cleaned to stir with.
I typically use...
Boil kettle to get my strike water heated
Lauter into bottling bucket/empty fermenter
Turkey fryer base for the propane (you seem to have this covered since you are already boiling 5g batches)
Copper wort chiller
Also depending on how big of beers or style of beers you plan on making, I would recommend a spare micro fridge for lagering or potentiall storing yeast.
I am working on that last step myself at the moment! Smack packs get expensive when you are brewing 10%+ABV beers
Finally if your LHBS allows you to mill there that is one less thing to worry about. If not, then you will need to build/buy some sort of grain mill.