I have found that one of the best, easy to use, clearo type is the new Kanger Evod.
Only one UK vendor has it, at the moment, and that is ivapour-elixir. -
http://www.ivapour-elixir.co.uk/evod.html
I did a review of it on my blog (
http://www.ecignews.blogspot.co.uk/2013/01/kanger-evod-new-product-review.html )
It doesn't leak, lots of vapour, good flavour - it does what it says it should (for a change lol)
In my opinion it is better than a Vision, Nova, and is an improvement on the Kanger T3/MT3 etc.
RoadhogUK did a you-tube review of it as well, and he liked it.