I haven't tried one, but I've talked to people in Europe who have given the "TeCab" good reviews. It's similar to a Joyetech "eCab," except that it has 510 threading. It takes replaceable 10440 batteries, which although are only 360mAh, are the size of AAA batteries and it wouldn't be a hassle to carry a few around.
TeCab E Cigarette Starter Kit in Black
Todd of Todd's Reviews gave it a thumbs up in his video on youtube.