Yes... Where is he? Robin is usually so prompt!
To answer the question, there is technically no equivalent of the 1.4 Ultimate pack in 1.6, due to several of the 1.4 mods never having been updated.
Some mods had to be separated with a crowbar, at the mod creators' insistence (TiCo & Gregtech), and became separate 1.5 packs (Unleashed [Tico, etc.] and Unhinged [GT focussed and containing only GT-approved mods], respectively) and will not be seen together in a pack unless you make it yourself.
There are also some mods that haven't made the transition from 1.5 to 1.6 for reasons ranging from not being developed to modder skipping 1.6 to work on the 1.7 version.
On top of that there are several new mods developed recently that as far as I know didn't exist prior to 1.6, such as Witchery, Blood Magic , Rotarycraft, Pneumticraft and so on.
Your best bet is to look at the list of mods you want from Ultimate and see what the best match in the newer packs would be, then find substitutes for anything missing.
