Using the livecd you will start from a minimal installation and later you will be able to install from network all (or part of) the components that are in the livedvd.

Here I recommend livecd just to speed-up and simplify download & test for this basic problem.

From this page you can get any version, yes for the devel version you need to download the latest weekly snapshot:

www.openmamba.org/distribution/download.html

one last question! Do i get the livecd i586 or x86_64, my processor is amd 64 !

Both should work, i586 is the traditional most complete and tested architecture, x86_64 is recent in openmamba and lacks some packages which may still require porting (this is not a big problem) plus still lacks some 32bit libraries support for some 32bit only non-free software (like Skype).

I am downloading this for trial! openmamba-livecd-en-snapshot-20130812.x86_64.iso

Ok, Using 'no splash & nomodeset' I am able to get a live session using the weekly build livecd!

But the system is getting very hot!

How to install fglrx drivers in openmamba?