Agreed, fair deal. Offer $200, and go from there. The seller may see that as a lowball, but if the tank needs to be hydrotested, that's a good $30 right there. Prophecy isn't a bad hopper, and it will keep up with the marker just fine. But the Ego6, according to this thread: Time vs Value - How quickly an Eclipse Ego loses it's value over time
, will be worth around $180 average. Who knows, you may get it for $200, you may get it for $300, or you will probably get it for somewhere in between. You won't know until you try.