For no leaks, I currently use my Ody, but its too wide for the Sidewinder which is really want to use as my on the go device, so....
I have a Killer rebuildable atty en route (somewhere over the ocean right now most likely) to give a go. Been hearing great things about them, and you can use it as a dripper, or in a carto-tank. I'll post up once I get it and have a chance to give it a go. I've heard they're great in trap tanks, but they should work in pretty much any cart tank, like the J-Tanks ENS sells, etc..
Also have an Ithaka en route thanks to a good friend, but, like the Ody, that'll be too wide for the SW.