For those who don't feel like copying a character over & downloading the client just to check out the prices of things, here is a picture I made that will show you the cost of pvp items after the patch. >>Clicky<<
This is from alliance side only, but horde should expect the similar prices on the horde counterpart items.
The rare/epic pvp armor shown is from a rogues perspective.
I'm not sure if it's more or less or different for other classes, but it should give you an idea of about how much those sets are.
This is straight off the test realm, things can still change between now and the release, so keep that in mind.
Price key -
Little alliance shield - Honor Points (horde side will be the horde pvp symbol)
Greyish square - Eye of the storm badges
Medal on a blue ribbon - AV badges
Big blue badge - AB badges
Stone rune thing - WSG badges
Enjoy!