Looking for Headamp+Preamp for ACA

I am about to buy new headphones, either the Audio-Technica ATH-M50x or AKG K371. I am also going to get a headphone amp. It seems reasonable to get a combination headamp/preamp to also work with my not-yet-built ACA 1.6.

I am considering the JDS Labs Atom or the Starving Student II. Both have line outs. The Atom is cheaper (if it is appropriate for the ACA) but the Starving Student is a kit and has tubes.

Any advice for me on which to choose or other alternatives.

Thanks for any comments,
Rick
 
I have the Starving Student II but not the Atom, so I can't compare. I am using the SS II as a headphone amp with Beyerdynamic T1 and am very pleased. It's a very easy build. You might also check out the ACP+ headphone amp and preamp.

I do have an ACA amp and am using a B1 preamp. It's a good combination.