I have the 1000mah kit too, and I'm glad that I tried out the tanks. I only picked up two of the dual coil cartos to use with the batteries on a whim, and I like them well enough that I think I'll be sticking with those on my next order o' stuff. The LR atties for the ego-t are nice, too, though.... and certainly cheaper. The ego's flexible enough to put all sorts of devices on it. You might like the tanks best or the dual coils.
It's probably just good to have a variety. Try a little of everything. There's no reason to settle! See if you can throw in a dual coil carto or two along with whichever ego kit you decide on, because you should be able to try it out with either one.