So I took this photo specifically to show people who don't have anything yet the different sizes.
From right to left you have a Camel Crush analog, Joye 510 manual with a standard size prefilled cartomizer, Inferno 650mAh passthrough with atty and drip tip, and Inferno 1000mAh with a big fat clear cartomizer. I do not yet have any type of mod, but they tend to be even larger than my largest (with a few exceptions where the mod is designed to be small rather than have alot of power or batt life).
I'm a big fan of my Inferno, but I feel I need to let people know that the Inferno is just an eGo clone like the T-Rex, KGo, etc...but is more expensive purely based on style and a few nifty features. I understood this when buying and was willing to spent the extra bucks for looks. You can get into an eGo style PV for quite a bit less money if you're not after looks.

If you like the aesthetics, the little extra perks like a bigger batt for more vaping with less charge and a batt that has a USB connection so you can charge while vaping at your computer and you're willing to spend a few extra dollars...then I can highly recommend the Inferno. If you do decide to go with the Inferno, I suggest the drip tip version of their starter kit and a pack of the Magma Mega cartomizers. You can do more research later on and find better cartos for what you want, but that will definitely get you started.
For you, I would skip the genuine eGo and go with a clone for 1 reason: You want a harder hit and the eGo kits you will find operate at a lower voltage than most of the clones and thus produces less hit comparatively.
Hope that helps you out