Flashing a new distro isn't risky at all. You can do a full backup of your current setup (different than the "backup" option in Cacko), then restore it to it's present state if you don't like the new distro.
I think that pdaXii13 is stable/user-friendly enough for most users, but only you can judge for yourself.
I also don't know if pdaXrom or pdaXii13 will improve your browsing experience much. For multimedia, you could try installing Quasar (search the forums for it). I hear it's a good media player.
Hope that helps.