I have the UK version of the first BSG season on DVD. It's the same thing as the US. I also got the min-series from Bestbuy as well. $74 for the whole lot.
According to reviews I've read, the future US version will have more on the discs than the UK version plus you get the miniseries included.
I looked at the Best Buy UK version and I was >< this close to picking it up but decided to wait on the US release.
I'm guessing you get to see some Cylon T&A on the UK version, am I right?
I hate to tell you this, but when the US release of season one comes out in September, it'll be $40 - $45 for the set, which includes the miniseries on the first disc.
(And I know Best Buy is selling the UK version at the moment. Apparently the US release has more commentaries, extras, etc. on it.)