I could recognize JAs review anywhere! He is a genius, and his info is vital to a lot of us that can't hear first hand and need to rely in other people's opinions and measurements.
4 ohms from 100 to 50K is the entire frequency range! Are you sure you copied that correctly? If that is true, these are certainly < 4 Ohm speakers! 600Hz is the very MIDDLE of everything you will be hearing, and that is 2.7Ohms. Ouch!
Still, let's say all this is true (which I am sure it is, JA knows his stuf better that anyone else I have read in the industry). You would still be getting 340 W from the Evos, which is probably more than you would usually need. Would more be better? Sure, but only if everything else is equal. So, let's say you had the same exact sound (not possible, lets just theorize for a minute) and you could get a 400 instead of 340. Then yes, for sure it would be better.
But if the sound is less rich, or less detailed, or a bit more colored, or ... you get where I'm going at. Perhaps it's better to have 340 great sounding Watts, instead of less good 400 W.
So if there is any chance for you to try them out and judge for yourself, that'd be great. Still, at double the price, I can assure you they won't be twice as good. No where near that much in fact. So if you are happy as is, you could save a lot of money and have both the amps and the $ wine Jason is talking about (or the PC games if you are into that!