Here´s an update:
I followed the guide on this forum one more time (getting XGL or AIGLX to work with compiz OR beryl) and this time I was able to actually install the packages (had to do it manually though), I did the gnome-xgl-switch thingy and this time I got a running X enviroment, which is an improvement... the problem is that now every time I do something related to the 3d acceleration on the card the X server restarts itself, (e.g., glxgears, glxinfo, or even opening the ATI info tab, not to mention actually launching beryl-manager). So I´m still stuck but I think I´m getting there
Any help would be awesome.
P.S.: I hope I dont have to wait until ATI releases an AIGLX compatible driver or the radeon driver actually supports my card x_X