Here's a screen shot of what I'm basically using now. I had just put this together so you'll have to excuse the mess. I'm still trying to get it all laid out the way I want it.
I'm fairly a returning player that is having to re-learn a lot of stuff and thus... most of these addons are completely new to me as well. If you know of better addons, please share as I would love to check them out.
http://images.wowstead.com/20883/4.jpg
Things I'm using:
FuBar (AtlasFu, BagFu, AmmoFu, etc)
Pitbull - Unit Frames ; still on the fence between this and X-Perl
kgPanels - for panels on bottom
Domino - action bar mod
Carbonite - minimap on bottom, and other nifty things
Recount - dmg stats
Rogue Power Bars - show up above my bags
UIM:ComboPoints - large moveable combo point graphics
Dead Boss Mobs - Its installed, but don't think its actually used for Khalidar
MikScrollingBattleText - has some nice features that I like
I've setup macros for almost all of my abilities now, and they are all bound to keys now as well. I just have to train myself to use the keys rather than clicking on them. Another thing I'm trying to do is get away from using keybinds past the (6,y,h,n) keys that I need in combat. I play mouse+wsad for movement so I want to keep my primary binds near by.
I'd love to get rid of the default minimap and all of the buffs that show up next to it.