Benchmark Dac1 - next step recommendations please

I've been using the Dac1 for over 6 months with my dvd player as a transport and long term I'm looking at computer->Dac solution.

While I like the Dac1 the next step is not as clear. Have folks used the USB Dac1 connected to their computer or perhaps upgraded to a higher-end Dac with a Squeezebox solution?

I've heard higher end players costing 3-5 times as much so I know you can get better sound. Current system: Dac1 - deHavilland UltraVerve - CJ 2500a

Thanks for the advice.