Best DAC that has a balance control

I would appreciate suggestions for a digital-to-analog converter that has a balance control.

My system is quite simple. I have a digital source, two monaural amps and two speakers. To feed my digital source to each of my amps I am currently using the Benchmark DAC1. That sounds great, but to really get the proper sound stage I need a balance control and the Benchmark does not have one.

I would prefer not to buy a Preamp. In essence my DAC functions as a preamp.

Suggestions are welcome.

Here is a link to my setup:
http://homepage.mac.com/hdomke/Audiophile_Mac/PhotoAlbum188.html

Thanks!
Henry