Well, as the tittle says I'm looking for something that let me see my current resource bar (rage / focus / mana) apart from my health bar, maybe with some utility (breakpoints color-changes / marks, warnings, icons). I'm currently using Elvui, so MoveAnything is not and option I think.
On 4.3 I used to have MageManaBar for arcane, DroodFocus for druid, HunterFocusBar for hunter, they were/are all good, but I'm just trying to find a replacement for all (homogenizing). It doesn't matter if it is just the resource bar alone with the numeric or percent display, all I want is a single one that can manage the resource bar for all classes.
I'm talking about something that actually creates a new bar and that bar keep tracks the resource, without changing anything of my current UI (should be like HunterFocusBar, but for all class/specs). I think Shadowed Unit Frames is like X-perl, it has just too many things I won't use.
Overall, Vex Power and Galvin's are all-around addons that show every resource type. Vex Power is slightly better than Galvin's when it comes to classes with 2 types of energy resources such as energy + combo points, energy + chi, runic power + runes, etc, because it has the ability to display both resources where as Galvin's only shows your main power such as rage, energy, runic power, etc. JS Hunter Bar is the best addon for hunters. Each of these addons are great at doing what you're looking for and they are highly customizable, which is always a plus.
If you are using ElvUI there is an extra addon to add this as an extra standalone resource bar.
This way it will match how ElvUI looks without having to fuss with other addons trying to match the look.