Thx sailorman. I'll try to grab one if I happen to remember to keep checking madvapes..(although the last tank you suggested to s/one and I bought, I'm really not liking, lol. SMOKtech eGo Dual Coil Tank )
Ditch the dual coil carto and put in a 1.7ohm resurrector or other good single coil carto and you'll like it more. It was one of the few carto tanks specifically designed for an ego. Personally, I don't care for carto tanks and I especially don't like dual coils on anything less than 4.5V.
Another one that I haven't tried, but is getting good reviews is a clearomizer tank for the eGo called the E1. They have replaceable guts for $2.50 and replacement tanks in different colors for $1.50
There's a review from one of the ECF members here: E1 Clearomizer - ReVive - v2 (discountvapers.com) - YouTube