I just recently beat Pokemon White Version.
I would highly suggest the purchase of it. The game mechanics are lowered from HeartGold/SoulSilver, however the battle system has sky rocketed into the future of Pokemon Games. The story has also far surpassed any other story (though Platinum comes pretty damn close)

World Gameplay 7/10
Battle Gameplay 10/10
Graphics 9/10
Story 10/10

The story pics up incredibly well towards the end. Not that it had a rough start, but it definitely says "LOOK AT ME!!!!!" the last hour or three of story.