DAC1 or DAC1 USB?


I have decided to try out the DAC1 in my system. Does anyone have any experience with both versions of the DAC1? I have been told by Benchmark that a few things were changed from DAC1 to DAC1 USB but I find it hard to justify a 30% increase in price especially when I do not plan on actully using the USB option at least for now. Any thoughts? Thanks in advance.

My very modest setup:

NAD (5 disc changer)
Stratos Amp
Harbeth 7ES II Speakers
Rotel 1055 (used as peamp, looking to use the DAC1 as a pre and dac)
kego
Get the USB,buying the nonUSB version is like rewiring a house and not running extra wires for the future.....whats 300$ in this goofy business?YMMV,Bob
The thing is, the USB implementation on the DAC1 is reported to be, uh, not so great. (This is hearsay, so I may be wrong.) I think we can all look forward to much improved USB DAC performance in the near future.
I have compared using USB and coax and we (my girlfriend and I) both agree that using Cal Audio Delta transport sounds better. I thought it's noticeably better, and she said "of course it's better."
What's $300? That's about 1/4 a Macbook which you can use to feed the DAC1 Macbook via optical out (next time you are looking to get a computer).
Chenc -- maybe it's just me, but your post makes no sense. You compared using USB and coax from WHAT and into WHAT? The Cal Audio is better than WHAT?