A valid option... but I use the basic blizbarzofd00m and have bare-minimum addons that modify them (rangecolor to show the hotkeys over the extra bars, and now abinfo).
I just hacked ABInfo code to show the mana cost of an ability on the bar instead of doing its maths to show "how many i can cast".
As much as the "count" might be more useful, I dislike "hand-holding" addons and can do the maths just as easily in my head, anyway.
It also means playing without the addon when I use my friend's machine won't be at all crippling. I just want an "at-a-glance" cost without having to tooltip-hover. The ABInfo-hack does that perfectly.
Thanks, though!