Taller!
I've not long been stocking minis myself but having the same thoughts, I'd like to start slowly cabineting as it can be hard to see or find the minis in packs, but it's just the initial cost of getting them painted (and I can't get EVERYTHING I stock painted because it's a lot, and some of it I may only sell a few, so it's not worth the cost, so I was going to get "highlight" pieces of every range, to guide through blister mountain.)
I've already started experiencing how quickly just a few people can cram up the stall but I guess that happens with cabinets too, I really like Ian/Fenris layout - just a big long cabinet with it all in!
Otherworld are quite impressive too, they have a huge cabinet and the blisters at the back that you *can* look at, but it's more like a stockroom area