If you can up your budget just a bit, you would be very happy with this:
http://cls.audiogon.com/cgi-bin/cls.pl?preatube&1129037174
It has everything you are looking for, including HT pass through and an excellent Headroom headphone amp, is built like a tank, and would hang in there sonically if you continue to upgrade other parts of your system. This pre was rated Stereophile Class A. It should work wonders with the Aragon, and without sacrificing your bass extension and detail. Disclaimer; I own it and yes, this is a sales offer, but also true IMHO.