You're all mad - choose the case-sensitive version of HFS+ when you install. Backup and re-install if you didn't do that.

You will occasionally hit problems with commercial apps not liking the case-sensitive file system, most notable Photoshop, but you can usually work around that (for instance there is a script that correctly renames all the files in Photoshop.app to work on a case-sensitive file system).

OSX is a very good unix - better than some with eg. its two-level name space for dynamically loaded libraries. If you want to use it as a unix environment I think it's a must to use the case-sensitive fs.