I've tried about 10 different menthol combos so far, and, by a pretty large margin, the best I've had so far is the Totally Wicked
e-liquid in 18mg (high) out of my EgoT. This is the best menthol flavor I've ever had, it's like a menthol/mint combination, I really enjoy it. Not exactly like a cig, but, IMHO, much better. Nice cooling feeling with a really good aftertaste (tastes a bit sweet on the back of my throat). Only problem is that it's pricey (almost $1/ml).
A cheaper alternative is the MyVaporStore 18Mg menthol. Much less expensive, and about 80% as good as the Totally Wicked.
I've also tried High Caliber 18Mg menthol. I'm not a big fan. It's got a nasty aftertaste. However, it does make incredible vapor (a ton of it!). I can vape it, but I much prefer the MVS or TW instead.
If anyone knows where to get something like the TW cheaper, please let me know. I'm willing to pay for quality, but, also, I'm afraid that I'm getting taken for a ride at those prices.