Around thiis time last year, I installed the Elfa system from The Container Store in 2 closets and kitchen pantry. My closet (6'x4') was about $800 and is just shelf/rods and open shelves. My wife's closet (6'x9') was about $1,800 and is a combintion of those, plus quite a few drawers, shoe drawers, etc. The pantry (3'x2'6") was about $600 and is a combination of open shelves and some drawers.
We've been very happy with how the systems look and perform. Installation was very easy, but just make sure you measure correctly because the support brackets are all cut to pretty exact sizes. The hardest part of the installation was removing the old shelving and patching/painting prior to installing the new closet systems.
One thing to maybe beware of: I don't know if this is a common practice, but Our Container Store included some random extra pieces we didn't originally request, such as shelf liners, and extra hardware we didn't need. They were happy to provide a refund on the returned pieces, but I'm sure they count on people not returning them. For us, it was a refund of about $300.