Under $1000 shipped
Do you want an integrated or a power amp? The following recommendations are integrated amplifiers:
The Rega lists for $900 so it should not be a problem. I think the Audio Lab in Cambridge is a Rega dealer so it should be an easy purchase if that's what you want to get.
Another choice would be a used Bel Canto Integrated but I think that will be pushing on the $1K limit.
You could try to find a Cyrus integrated but I don't know if they are sold in the states.
I don't know if a headphone amplifier would give you enough juice for your 96dB speakers but if it would then your choices open up tremendously.
If you want to go cheap there's an Emotiva unit for $200.
If you can fit a slim full sized unit in your luggage head over to
www.audioadvisor.com and search for integrated amplifiers. That will give you a good representation of what's out there.
If you want a small power amplifier that one is tougher. Bel Canto has a couple but I don' know the price point.