My personal opinion would be to go with a Riva 510 from Liberty-Flights. They are $30 right now (click the 20% off link at the top of the page). Comes with 2 whole e-cigs.
Electronic Cigarette - Starter Kits - Riva 510
You wont need a PCC with these, the batteries last for hours and having 2 of them will save you (I haven't had one run out on me yet).
Get an ego PT from the same website. $20 with the 20% off code. These things are amazing

You can disconnect it from the computer, screw the cap on, and it works JUST like a normal battery.
Electronic Cigarette - Pass-throughs - Joye eGo
And I got one of these carrying cases to hold it all together -- I can carry 2 whole PVs, 4 bottles of juice, 2 atties, 2 drip tips and a spare empty cart for anyone who wants to try it out.
Electronic Cigarette - Cases, Lanyards & Other Accessories - Joye eGo
As for not topping off all the time, go with Cartomizers. I hear great things about these cartos, they have a ceramic chamber (so there is no filler, nothing to burn).
Electronic Cigarette - Cartomizers - C-E2 - 510/808D-1[901]/401
If you want to really NOT fill for an entire day (or more), go with a MEGA/XL cartomizer -- they hold 2ml of liquid, twice as much as any 510 carto out there..
Electronic Cigarette - Cartomizers - Joye eGo Cartomizer
Shipping for me was FAST--- they are in California, and less than $3.
I don't know anything about mods, so someone else can chime in for that. But this is my personal opinion!
I would buy your juice elsewhere though.. I hear good things about Tasty Vapor and Mrs. T's Bakery (haven't tried myself) for the sweet stuff, and I liked Gourmet Vapor (you can make your own creations online or choose from others).
Best of luck to you!