I think in the early days these cars got a lot of unfair criticism but in the last few months i have read nothing but good reports on them.
Was reading a magazine recently but can't remember which one it was and they did a buying guide for the Mk1 FRS and if my memory serves me right they summed up the phase 1 and phase 2 differences pretty much the same as Lambchop has posted. They also said that it was a cracking car and any early problems have usually been sorted by now by the previous owners.
Good luck with the new car. Update us on what you think of it once you driven it.