Currently using a GSM Galaxy Nexus with SlimBean, and I've used ParanoidAndroid recently but ultimately didn't like it due to the size of the screen. I'd prefer a ROM that maintains (or doesn't break) most of the stock features (S-Pen and Bluetooth/Apt-X particularly), and I've heard MIUI is good in that regard; I haven't used it in the past (on my Galaxy Nexus of G2) because I always found it too laggy and too high on RAM usage, but I've always liked the overall look/feel and features. Something that isn't too hard to get working with tethering (without the plan obviously) would be nice too.
Anyway, recommendations? I'd appreciate reasons for the recommendation too, and something more than just "great battery life" (which I appreciate, but with the size of the phone battery and how often I'm near a charger, it's literally the least of my concern). Thanks!