I've had great luck lately with new Kit Kat based roms and WildKernel
I might suggest waiting for the next version of WildKernal, as there might be (not sure) a small issue with second core control,
and the dev is also going to be releasing his own kernel control app in the near future.
Otherwise, the Slim roms have been fantastic for just plain snappiness, stability, and battery life.
They are on 4.4.4 now
which is very nice (and stable), but if you're more comfortable with it, they have 4.3 and such as well.
Personally I'm using Validus 6.0, which I'm not sure is offered on XDA for our device, but there is a google group
for Ground Zero roms. It's 4.4.4, ok with battery life, but has a bunch of features.
External link to official Google+ post for Hercules Validus 6 rom
I'd really recommend a Slim Rom if you're not worried about a theme engine though.