I would recommend an eGo/Tornado kit for you. Battery life is long, 6-8 hours between having to change. They're manual switches, and they're solid vapor producers. The manual ecig is just basically pushing down a switch when you want to use it, as opposed to it sensing you draw on the inhaling end and activating with an automatic. You control the battery life basically.
Juice, you can get from almost any supplier in the forum, almost all of them have some form of juice. Getting a solid opinion on what the best is, is a difficult task, everyone has their favorites.. so I'd suggest hitting up the juice reviews and the supplier reviews, and maybe look for a local supplier if there is one on the forums. This is the one thing you have to find out for yourself though, since everyone likes different tastes.
As far as the eGo/Tornado goes, it's becoming a favorite of pretty much anyone that tries them, and is a very solid performer from what people are reporting as well. It uses the 510 atomizer threads, and 510 carts.. which gives you the option of the cartomizers for the 510 as well, which are one piece units that contain as the name implies, the cartridge and atomizer, sealed together and designed to be thrown away once emptied... but the good people here have many different ways to refill them, ranging from super easy but potentially messy until you get the hang of it.. to a little more involved but a little less messy.
The other options from there as far as getting the most out of your PV in my estimation would revolve around a mod of some sort, e.g. a Chuck, or a Screwdriver, GG, BB, etc. Generally a system that uses independent Lithium-ion/Po/Mn batteries. This generally gives you a very decent battery life, and can be a lot more cost effective over time as far as replacing spent batteries. If you choose a mod, I would strongly suggest researching them thoroughly, as they all tend to differ in size and shape.. some the size of a small hand flashlight, to the box mods that vary in size as well. Some even inventively containing a pushbag inside that feeds drips into the atomizer without having to mess with bottles.
E-cigars, I can't comment on, I know next to nothing about them and haven't had the inclination to look into them.