Help me decide on a purchase of a used Prius.

I will be looking at a 2004 Prius with 200k miles. Seller says the battery pack was replaced and still has 6 month warranty. Asking 4000 . What do you guys think, should I pass on this car or should I buy it. Would this car still have some life left not that the battery has been replaced. How would the engine and transmission hold up for the next 2 years and probably 30k miles.