Whoa...I soooo over paid for my cartomizers.
For what its worth, I was more or less @ 10 a day and I really like those cartomizers. I have some that are 2 ohm. I like the extra "oooomph" I'm getting from the 2 ohm cartomizers, but they sure burn juice fast. I'm ready to order more (I've kinda given them out to people as I don't really like the idea of them demoing my tips) and will likely get the 3 ohm like you've chosen. $5 for 5 seems to be a great deal to me.
I normally stick to 1 flavor type (more or less) and have been using a single cartomizer for the better part of a week. Its gotten much more use than ½ pack per day

. I find it funny when people say, "you were ½ a pack a day - you can go an entire day on a cartomizer". I can't. I'm lucky if I get 2 hours. Maybe because I'm using the LR cartomizers? I have top it off several times during my day (drip tips FTW!). It takes like 30 seconds really - like dripping but lasts longer. Much better than the tank I have. If you're patient and let it soak for a while, you'll get more vape per refill, but who has time for this "patience" stuff?
Anyway - the cartomizer I was using finally got to the point where I felt it wasn't producing like it should and I tossed it today. I can't really complain - I enjoyed it for an entire week. Was kinda sad to see it go though. Like saying goodbye to an old friend
...and then I opened a new one and I was happy again
(note: the
mega cartomizers DO last me an entire day and then some, but they are a pain to fill as you need a syringe. The boge style are much easier. I'd be ecstatic if one of these little boge style cartomizers would last me a full day.)
You might want to add a drip tip. You can pull the little rubber tip out of the boge and use a drip tip. They sell them on the site you're ordering from. It makes it a breeze to top off when needed.
If I were you, I'd worry about a case later. The ego is pretty sturdy. Mine lives in my pocket when not in use and I feel its pretty secure. 1 battery takes me the majority of my day - nearly 14 hours away from home. I tend to switch batteries in the middle of the day out of habit, but I've made it an entire day on a single battery, albeit, less than my normal use. The battery is small...like carrying a lighter. I'd pick up another charger assuming you'll have access to a USB port through out your day:
Joye eGo USB Charger. I've found it a nice accessory. Charge both batteries as you sleep and you'll be fine for a full day.
Nicotine level: you're on your own. I read most people use 24mg nic. That just demolished me far too quick. Headaches, dizzy, nausea, etc. It didn't help that this was all new and exciting to me. Even 12 was a bit much for me and I'm a decent sized guy. I recently received some samples from Blue Mist and I mistakenly ordered 16mg. A few "drags" reminded me why I dropped down to 4mg! (You 36mg'ers out there amaze me.) You're really going to have to get a few bottles of different strengths to figure out what you're happy with. I'd personally get a few empty bottles for your own mixes and a large bottle of 0 nic juice. Stuff like Vanilla and menthol mix decent with just about anything. That way you can at least cut your nic levels down if needed. It would really suck to see you order a bunch of 24-16mg juices only to find out your tolerance is closer to 8mg.