Revel or Aerial

In my limited listening experience this far - about 4 years into a system build - and probably have listened to a dozen brands(and numerous models) of speakers. From Sonus Faber, B&W , to Vandersteen and PSB - my most memorable experience to date was listening to a pair of the Aerial 7Ts. Just incredibly enjoyable sound - I have not heard the Revels, so no direct comparison for you. I currently own a pair of PSB Sync 1s - which are very good - but see myself saving for the Aerial 7ts in the long term. My setup is Ayre integrated and CD, with PS Audio as my computer DAC - a bit of a Boulder CO setup.

I second trying some different gear behind your revels, they are VERY transparent, and the better the gear behind them the better they will sound. I own the Revel f32s, and run them with a Bel Canto dac 3.5mk2 vbs and Rogue Audio M180s and a rega P5. Love the sound.

Aerial speakers is the best money spent for desired performance among most mentioned and unmentioned.

In general I'm very happy with my Revel F208s. I'm just looking for opinions regarding the best way forward on trying to get a little more detail/clarity. Again, my only question is getting new Speakers a better option than changing electronics. What will yield more cost effective with results?

Your detail and clarity can be improved by upgrading your source, your NAD is great for the money, but can be improved on dramatically. I will say however that if the budget allows it the Revel studio 2s will give you more clarity, but with less warmth and are less forgiving of bad recordings than your F208s. I work part time at a store that carries your NAD, compared to my Bel Canto dac3.5 mkII with the VBS power supply its no contest, and should not be for the added cost difference between the two. The Bel Canto is FAR more open, with a better sound stage separation and low level resolution.