I think the calfskin is more expensive. I saw a dark brown calfskin PST at the store last weekend and it was $1350. I'm not an expert in chanel though...
Both of mine are the caviar, they were $1650. I got mine before the increase actually, because the SA I bought the white one from told me to get it when I did (at the end of January) before the increase. And I bought the navy one w/silver hardware last February.
Most of them are caviar, I can't give dimensions, but I know there's black, white, beige, pink, navy and silver at least in the GST, most of those colors are also availble in the PST.