I'm all set with my grow shelves, but I'm posting this for others who may be in the market. Lowe's has this shelf on sale for $60.00 for a little white. It's what I use, except mine has casters on the bottom (purchased from Costco). It's perfect because you just hang 2-3 fluorescent fixtures (dual bulb) over each shelf using chain, Hell of a lot more sturdy than ones in catalogs for $700+. Each shelf holds 300+ lbs so no worries about strength. I think they're the best for growing seedlings in any reasonable quantity.
Chris
Chris