I'm using a blu kit right now, and it's serving me well for the most part. I initially liked it for its size being so close to an analog, but stardard 510 cartos are just a tad wider and that makes it less convenient to carry since they don't fit the PCC. It also messes with my slight OCD, lol. Someone gave me a Fin starter kit, and I'm getting used to something slightly bigger than an analog, but I don't really want to go much larger than that size batt with a standard carto. The panda kit looks pretty good, and while the clearomizer and mouthpiece make it much longer than my ideal, I do want to use clearos on occasion even though I plan to use cartos most of the time.
Essentially, here is my ideal cigalike battery
510 threading so I can stick with a standard used by most everything I'll end up "growing into" even though I'll probably only ever use larger devices at home. Auto type, black, stainless, titanium, or royal/navy/midnight blue. silver connectors instead of gold, blue LED tip (preferably not a jewel). Lettering or logos on the batteries should be simple, single color, and not tacky looking. About 65-70mm in length, so that when paired with a cartomizer the assembled cig is about 100-105mm.
Oh yeah, and if it's single batts and not a kit, preferably around $10 per batt. I honestly don't understand why some sites sell them for 20 when it's the same piece of chinese garbage everyone else has, but then a company like Revolver has well made ones for 12.