I use my Evo for business as others that have replied. My criteria for Roms is simple; everything must work and be stable. I really don't want to reflash Roms every other day. With that said, MikG rocks. All I have done is change the wallpaper basically. My battery life kicks! This is with the standard kernal that comes with it. Don't worry, just flash the zip and the kernal will be installed. Keep it simple. In fairness, I have heard good things about Decks as well but haven't tried it. You probably can't go wrong either way. But I have had MikG for a couple of weeks and it is the bomb!
One more thing. There are a couple of apps that didn't flash over from the stock rom that could not do without: Swype and TeleNav. Google the Nexus_Swype.apk and you can get TeleNav on the market. Put both in the root of the SD card and double click to install.