There has been a lot of discussion on this, and really, do get the originals. You do get what you pay for. 3rd party batts may seem to have better specs (like higher mAh rating), but in reality they don't last as long as originals. It's really hit-or-miss. Some batches may be good, but some are absolutely lousy. They may be dead out of the pack, or just die suddenly 3 months down the road.
Don't take the risk, lah. Your camera so good, why power it with some dubious source?