I think the Tekk mod is pretty cool... of course the ProVari is pretty cool.... and the Darwin.... and the GG.... and the Reo's...
My ego-T came with a necklace/lanyard thing. I have intermittent arthritis, and some other problems, and tend to drop stuff all the time. I think the other cool mods are probably too heavy for me to wear to bed (I sleep in a semi-upright position). Oh, the GLV mini would work around the neck....
but in the end, I'm probably better off with the ego-T right now. Maybe when the batteries go, and are out of warranty, I'll look into something else..
It's a wide, wonderful world of mods out there. I come across multiple ones daily that I'd love to have.
I see peoples signatures, with lists of 10 mods they own.. I get really jealous. (shhhh.... don't tell anyone!

)