i love the t3s myself and havent had any leakage from any of the three i have as yet, but if youre looking for something a bit different there are some new ones, namely the innokin iclear 30 (dual coil long wick) which is getting good reviews, it comes with the SVD or can be bought separately for about £15, i havent tried one myself yet but all the reviews are pretty positive about them.
there is also the upcoming kanger protank which also looks very nice, bottom coil like the other kangers but bigger and all made of pyrex and stainless steel, again not tried one but they look top notch. the last one that i havent tried either is the EVOD which is also getting good reviews, its a bit like a modified slightly shorter kanger mt3 really
ones ive tried:
kanger t3: excellent, my current fave
mini nova: pretty good, but in my opinion the t3 trumps it on flavour and vapour production
vision CE4: pretty crappy, came with a device but its far from the greatest tank ive used but its functional in a pinch
itidy 10: very compact if thats what youre looking for and not bad flavour either but it spits and gurgles a bit and is prone to leaks