Lots of great info... thanks all. Sounds like TheDarthVap3r needs a shopping intervention

Thanks Baditude for the response and pics too. I see this as something I'll be doing for sometime, and after reading others' replies it sounds like my ego could go anytime (had it 2+ months now). I also go outdoors dog-walking/hiking for a couple hours or more everyday and keep my ego in my pocket, so it sounds like the standard sized Provari may not be the most practical option...
cactus, why would your ego go anytime? I've had joytech ego batteries going on 2 years now and they both still hold charge and last as long as they are supposed to. Unless you are talking about your atty in which case 2 months is a good amount of time for it to last!
I started over 2 years ago with a 510 and within 2 weeks had a an Ego set. I upgraded my batteries to the twists when they came out. I fiddle with the voltages every once in a while, but usually keep it at the same voltage.
I don't have a mod and I really don't feel I need a mod. I use what works for me.
Some people may need a mod so that they can stay away from the stinkies - you gotta use what works for you.
As long as you are not smoking - I don't care what you use.
It's really easy to get caught up in the moment when everyone is talking about how great their x,y,z (insert your battery, mod, carto, atty here) is and think that "hey, I need one of those". Man oh man, I have been there and done that!
But, if you have a set up that you are happy with and it is working for you, why would you feel that you "have" to trade up?
You don't "have" to do anything.