Given my AMP and DAC, which preamp?


I am about to receive a Dodson 218 DAC. I have a Pass X250.5 amplifier (please view my system). I essentially have a one source system (hard-drive based, digital). What I am wondering is, what preamp to get? I am wondering whether a tube pre would work well or maybe I should go with a matching Pass Labs preamp? I also can't rule out some kind of volume control like the Django. I would really like to hear from those with similar systems to my own. Thanks for your time,
pardales
I second the Placette active unit or the First Sound Presence.The Terra Song (up for auction) was dependable and made tube comparisons a breeze.
I went through a number of tube and solid state preamps and ended up with a Placette passive for several years. I upgraded to the active and have been totally pleased. I'll second TeaJay's recommendation. The Placette active is the best preamp I've heard.
Played a hunch and went with the new Modwright SWL 9.0SE. It is burning in as I speak. Thus far, I am blown away.

I could not go for the Placette as I like to have a volume knob to turn; also, the look and how I interact with the equipment does matter to me (wish it didn't some time, but alas).

Thanks for your suggestions.