Ok I understand now. Maybe I'll try out Jesse on a spare hdd when it's released and see if I like it better than Crunchbang.
Immediately after a new Stable release, Testing will be fairly close to Stable for about 2 weeks before it starts to see extensive automatic imports from Unstable, and Unstable will get new imports very quick and become much more unstable than normal for a couple months. I recommend that you hold off trying Testing until it goes into release freeze unless you are a developer. During a new release's development cycle the main difference between Testing and Unstable is 2 weeks.
Since Crunchbang is essentially just another repository that can be added to a vanilla Debian install, you could install Crunchbang, edit your /etc/apt/sources.list
to point to testing (or unstable) instead of wheezy, and perform a dist-upgrade to try out the new packages without missing Crunchang's customized Openbox experience. Many popular packages are backported from Testing to Stable, so I recommend that you just enable the wheezy-backports repository to get access to a subset of new packages unless you are confident that you can deal with occasional package upgrade problems and broken packages while the new Testing slowly stablizes.