Do not buy any Ego that isn't listed as Joye Ego or Janty Ego. The others are mostly clones and some clones are not as well made. If you want a real Ego buy Joye or Janty only. I also recommend Liberty-Flights.com and press the 20% off first then look at the prices (the shown prices will show lower). Regarding Ego-T, its one benefit is battery that can be disabled/enabled with 5 presses. Many find the tanks annoying but you could always buy regular atomizers/carts/driptip for it and use cartomizers too if you don't like the tanks. If you buy regular Ego or Riva 510, you can always buy a tank atomizer and tanks if you want.
And the Riva 510 models at Liberty-Flights are well-made and popular clones and they sell a lot of them so they always have the latest model. The latest models also run a bit higher voltage than Ego. I got my Riva Lite Bundle there for under $30 with that 20% off - 2 complete 750mah Rivas.
And I recommend trying Boge 510 cartomizers with Ego or Riva 510 - standard resistance (2.8-3.2 ohm) to start out, then if you want hotter try the 2.0 ohm (which also use your charge faster) or if you can find them, there are also 2.5 ohms medium ones.
Since you are in the US make sure you go to Liberty-Flights.com, not .co.uk (their UK site)
Here is the link with the 20% discount already applied
http://www.liberty-flights.com/discount/liberty-flights-20.asp