I think you've nailed it; the XA1 is a steal at these price levels. And its upconverting ability is awesome to say the least. I have an A1 and an XA1, and they both do a great job with my SD DVDs.
I would advise not to go to firmware 2.0 if you're using DVI, as this may introduce a problem concerning loss of detail in dark areas. With any firmware but 2.0, you can roll back to Firmware 1.2 0r 1.3, as these do not suffer from this bug. I also understand a fix may be coming next week that should make all of this a moot issue.
Good luck!
I would advise not to go to firmware 2.0 if you're using DVI, as this may introduce a problem concerning loss of detail in dark areas. With any firmware but 2.0, you can roll back to Firmware 1.2 0r 1.3, as these do not suffer from this bug. I also understand a fix may be coming next week that should make all of this a moot issue.
Good luck!