So I've been playing around with SkyRe for some time now but I feel it just changes way too much for me to be comfortable with. So I am looking between ACE and Requiem as they are more modular and seem to touch less in the game. Can anybody give me some feedback on them?

Requiem changes the game even moreso than SkyRe. It introduces a lot of gameplay mechanics not found in Skyrim, mostly inspired by old titles.

Your best bet would be ACE.

What changes do you want to make to Skyrim? Until we know that we don't know what mods to recommend.