There are a few really nice bottom feeders to choose from. I think some important questions for you are how many ml do you vape a day and are you going to use this primarily at home or take it out often? I have two, one for at home/all day vaping and one for taking out with me. The at home feeder is a wood Hog mod, holds a 6ml bottle and a 18650 3000mAh 3.7v or one of the 5v batteries or can even take two 3v batteries stacked for 6v vaping. The smaller one for taking out is a REO Mini, holds a 3ml bottle and a 14500 900mAh 3.7v battery. Personally, I don't find the Mini comfortable enough to hold for all day vaping nor does the battery or juice capacity last me all day, but it's wonderful for taking out and I know if I drop it, it will survive. The Hog mod is very comfortable to hold, holds exactly what I vape in a day and the battery (18650) will still be going into the next day. LR atomizers on this mod are fantastic. You do have to push the bottle to feed the atomizer or cartomizer, but other than that and filling your bottle/putting in your battery(ies), you're set to vape the life of the bottle and batt(s).
Besides the Hog and the REO mods, you might want to look at the VMod from Vapage, RedSky mods, The GRIP, Monkey Box. There is a very informative thread here on ECF about all the available bottom feeders...not all of them made it to the original post, such as the newer made Hog Mods.
These are my babies:
Hog mod (opening to push the bottle is on the back of this mod) and REO Mini