I broke down and replaced agUF in favor of oUF. The fact that you can make your own layouts and display formats is wonderful. Mine looks very similar to how agUF looked apart from the raid frames.
I based my layout on oUF_mono and did some tweaking to it (like adding rested and pvp flags and changed some of the hp bar coloring)
I have not tried out oUF_Trinkets, but if you're into PvP, it flags your target when they have used their trinket.
I do not use SmoothUpdate to smooth out the hp bar refreshes as it causes a horrible 2 second delay whenever I change my target. I guess it requires a beefier system than what I currently use to play WoW with.
In order to tweak it to your liking, use the oUF_MoveableFrames addon to move the frames where you want them and you can also edit the cfg.lua file inside the addon itself to turn some things on/off/position/etc. The addon can also replace the default buff/debuff frame with it's own display, but you need to mess with the following lines to get them to how you want them (mine has them off).
cfg.stylebuffs = false -- replacing default buff frame
cfg.BUFFpos = {"TOPRIGHT", "UIParent", "TOPRIGHT", -160, -20} -- buffs position
cfg.DEBUFFpos = {"TOPRIGHT", "UIParent", "TOPRIGHT", -160, -125} -- debuffs position
cfg.BFIsize = 32 -- buff frame icon size
Party frames are not shown in the picture, but they will appear above the Raid frames and below the Player frame. The raid frames will always display whether you are solo/party/raid. I use them to heal a lot and prefer them over the party frames which is why I always have them displayed.
Links:
oUF: http://www.wowinterface.com/downloads/info9994-oUF.html
oUF_MoveableFrames: http://www.wowinterface.com/downloads/info14408-oUF_MoveableFrames.html
Optional:
oUF_SmoothUpdate: http://www.wowinterface.com/downloads/info11503-oUFSmoothUpdate.html
oUF_Trinkets: http://www.wowinterface.com/downloads/info15432-oUFTrinkets.html
original mono: http://www.wowinterface.com/downloads/info17763-oUF_mono.html
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I'll add, if you use ag_Uf, the current author isnt planning to update its features and only "keep it functional" which means once Cata comes its likely not going to incorporate any of the new UI additions.