Define what kind of storage you need. What you'd like to put on shelves, do you need cabinets, do you need drawers. What would go into each of them.

Then look online/in-stores for inspiration. Europeans are big on such walls, so check everything modern/contemporary that you know of, from IKEA to Ligne Roset and Roche Bobois..made in Scandinavia-or France, Italy, Spain..don't concentrate on prices just yet, but look at these as inspiration. If you live in a city that has big design center with European furniture-visit. Needless to say look at magazines..smth like AD, Living Etc, Dwell..

Then decide on the general concept..you can go a store route or you can go custom route. Say I went custom. Was cheaper than a high end store would be-and I really liked the process (we have two walls-for books, and entertainment). We worked out all the details with the cabinetmaker.

But when in Europe, I went with a store. Unfortunately I don't remember the company(was Spanish manufacturer)-you could choose finishes, and put different pieces together as in a puzzle. Twenty years after the system is still alive and well, it changed 5 houses I think, and two countries. It's in my ex's house now. It's smaller than the system that we have now. Easier to reconfigure. I imagine you also need something smaller.

The concept is similar though-I always loved wood plus color, so the old system, is cherry and cream. This one, is teak plus cream plus aubergine. Both have drawers, closed cabinets, shelves, console, etc. I was also able to take new custom system with us when we moved houses. Had to let one of the shelves go-the ceilings are lower..)) We repurposed it.

Yet another way to go-is to visit vintage stores that carry, say, mid century modern. Even if say it doesn't fit your spece or neeeds or aesthetics exactly-it's a good sourse of inspiration.

For American based stores, check DWR and ..oh the name escapes me..I'll try to find it if I can..they have some cool stuff.

ETA: found them! Organic Modernism

http://www.organicmodernism.com/index.php?s=4#shelves