We need to pile stuff up high to keep our 2000 sq.ft. clear. The shelves we have found that do the job best for us are these 18 Gauge 73" high ones from Global Industrial. They're boltless so they're easy to set up and you can easily adjust/add/remove the shelves. They're also a little less expensive than 'wire shelving'. We have tall ceilings and we like the shelves to reach pretty much near the top.
The next ingredient in our storage sandwich is bins. We really like stacking bins like shown above stacked on the shelves. These are the really nice Akro Bins (also available from Global Industrial and other shipping supply shops) . There are knockoff ones you can get but they're usually not as strong and dont nest/stack as nicely. We suggest going for the clear Akro bins. They come in every size! Every product has a bin with a label, and that's worked out really nicely for us.
For components for kitting, we also use bins but we use mini-bins on a louvered wall (also called a 'pick rack'). What's nice about these is you can remove and replace the mini bins without disturbing the others. There's a few different types at GI.