As I understand it, the pre vs2 is a bit more focussed with the sound, with the xvs a bit smoother. Saying this I have never heard the xvs, so may be talking crud!
If you go onto the cyrusunofficial forum website, and ask the question there, then they may be able to give you a better answer.
If it is any help, I paid £310 for my vs2 delivered. They go for around 300-350 on ebay, but check on the cyrus forum site as they have members selling their goods and they will of looked after them.
Im going to be getting mine upgraded to the pre xpd later this year when funds allow.
Phil