I use the Discgear Selector 100 (you can google it), I have many, many of them to hold my collection of 4000 discs. I found the Discgear to be the best option out there for several reasons;
1 - Does not "outgass" noxious and destructive chemicals, which can degrade the CD poly over time.
2 - Holds CD in a way which is upright, stress and contact free; which prevents warpage and surface damage.
3 - the obvious space saving.
4 - the super easy "indexing" CD finding and extracting system, which is playing suface contact free.
Again, I looked at multitudes of other CD holders, boxes, sleeves, storage, etc devices out there; played with them, tested them, spoke to the companies, and so forth -- and the Discgear Selector is what I found to be the best protection for my $80,000.00+ investment/collection.
And, No, I do not have any relations with Discgear -- I'm just very happy with their product. That's my 2 cent.
Oh, if you do decide to go with this system, or any other for that matter, its best to type yourself a catalogue/index of whats is where. I have numbered all of my Discgear Selectors and print a catalogue of each CD to it's location.
best luck