DACs with High Voltage Output

I am interested in upgrading my DAC. However, the integrated I run and like a lot, the 845 based Bel Canto SETi 40, needs a high voltage output to sound its best (at least 4 v rms). I have been working on finding DACs that fit that parameter. I'd love to get some input from the Audiogon community. Additionally it needs to have a USB input.