I use:
Convenient Horses. (http://skyrim.nexusmods.com/mods/14950)
UFO - Ultimate Follower Overhaul. (http://skyrim.nexusmods.com/mods/14037)
Riverside Lodge with Sauna. (http://skyrim.nexusmods.com/mods/14308)
Rayeks End - Mini Hideout. (http://skyrim.nexusmods.com/mods/16028)
Werewolves Occurring Naturally. (http://skyrim.nexusmods.com/mods/22622)
Spouses Can Live Everywhere. (http://skyrim.nexusmods.com/mods/11370)
SkyUI. (http://skyrim.nexusmods.com/mods/3863)
Tamriel Compendium. (http://skyrim.nexusmods.com/mods/10462)
Also use 2-3 more but they do not have ESP files, only textures/meshes so I assume it dosen't matter for those mods. All the mods on this list are up to date according to Nexus Mod Manager, except for the Tamriel compendium because I added that via Steam so it dosen't show among the rest of the mods.
I would just stick with 1.6 just to be sure, I never patch a modded game unless I'm starting over on a brand new character.
I would, but Steam updated my game without telling me so it is already updated.

EDIT: Just read in the comments on one of the mods that 1.8 is released? I was in the game just a few days ago and I swear it was 1.7.. now I'm honestly not sure if it was 1.8 I had when I checked last time, or if it was 1.7.. and not sure if it was 1.6 or 1.7 I had last time I played/updated the mods x_x *confused*