Thanks everyone for your input, both in this thread and on others that I drew from while planning the building. Here are some of my decisions -- again, most based on feedback here on TBN.
SIZE: I increased the size of the building to 24'x35', which is all I could do given the space and cost constraints. The materials have been delivered and it'll go up as soon as the concrete is poured and cured.
WIRING/WATER: I'm running a 100 amp sub panel through 3" conduit buried 3' using aluminum (gasp! hey - it's SOO much cheaper) #2 wire. The run is 250'. I'm also running a 1" line for water (hose bib for power washer) and another 3/4" conduit to pull some ethernet cable (for a security camera) at a later date.
FUEL: Ok, this is part I'm most excited about. After reading seemingly every thread that mentioned "fuel," "gas" or "diesel," I decided to pick up a generic 275 gallon home heating oil tank. I paid $200 for one that was only a couple of years old, and Tiger (Exxon) will fill it with 150+ gallons of diesel without a delivery fee. Today I ordered a Repackaged Fill-Rite 610 115V AC Transfer Pump, Krueger Sentry Stainless Steel Direct Reading Gauge, and Cim-Tek 3/4" Pump Filter Kit from JMESales.com. The tank is vertical and stands on legs, so it it'll take up very little space in the building. If everything works out, I'll have my own little pumping station before you know it. The gasoline solution isn't as cool -- I got the Northern Industrial 30-Gallon Steel Gas Caddy from Northern Tool. I plan to keep it filled by siphoning gas out of my truck's gas tank if I can get the hose in there. If it works, that'll keep me from hauling it to the gas station and back on a regular basis. We'll see.
IMPLEMENTS: I'm still going with the pallet truck. I can't pick up many of my implements without using pallets, so I'm going to try the "get them from Home Depot" method suggested by someone earlier. Wish me luck.
LIGHTING: 3x Designers Edge Diamond Plate Pro Series Plus Shop Light — 48in., Model# L-88 from Northern Tool. I'll use cold weather T8 bulbs.
VENTING: TPI Shutter Exhaust Fan — 16in., 2840/4180/5110 CFM, Model# CE-16-DS, again from Northern Tool. Not sure how much airflow you need? Go here:
Airflow Calculator.
SHELVING: There are some fantastic shelves at Lowes. These aren't those exactly, but they're close. I'm going to have 28' of these along one of the walls:
Edsal at Lowe's: 3-Tier Wood Freestanding Shelving Unit
Thanks again for your help. I'll let you know how things go.