Rogue Focus Classic (RFC) shows Combo Points and Energy Bar in one simple addon, for Rogues and Cat Form Druids.

By the option window (type /roguefocus or /rfc to open it) you can:

show health bars of your character and the selected target near the other bars, in order to watch only Rogue Focus Classic without look to the target frame bar.
Activate RFC frame when in stealth, in combat, in other cases, and with all the possible combinations of these options. ;)
Listen an audible ticks when the energy bar is full ("Tick!", "GO!").
Lock the addon window in order to don't interfere with mouse clicks.

Thanks to the following people which I made use of their code:

Masso, the original creator of MassoComboBar.
VectorAN, the original creator of EnergyWatch.
Lonny (VoidRaider), the original creator of RogueFocus.
Dridzt, "Frame lock" and "Audible energy ticks" coder.
Larven, "Health bar" coder and co-author of version 1.2.0.
Squirrelbot, co-author of version 1.2.0.
All the people that in various comments suggested features and bug solutions.

Reminder: Rogue Focus Classic has reached its objectives. It comes with the main features working well. If someone wants to integrate more bars, stuns, bleeds etc., or wants the ability to hide the combo bar or energy bar, he can code it and he'll receive all my efforts to keep updated addon in this site, giving news and obviously adding his name in authors list. Remember only to give the ability to show/hide the new bars in the options window, in order to keep Rogue Focus Classic simple and clear like I wanted when I've put my hands on it. Thanks!