Hi Matt
I have the Storm and 300 - 400 psi for stairs is to high, first turn it down a bit to around 250 that should be more than adequate. As for hand tools, personally i use a stair tool 6" inch, a bit cumbersome but once you get use to it makes it a lot quicker, you might want to get a whip hose (short length of 1 1/2 hose) to make it easier to use on the stairs. What are you going to use on upholstery? I would recommend a Sapphire hand tool, expensive but worth it. Both available from Cleansmart or other suppliers.