staktup:
Yes Stringy is correct, I would place that around vintage 2006, The Oasis came out a year or so later with the twist and stow rudder and a slightly different rear deck, other than that the designs were very close.
Here is the only pic I have of our 2008 Oasis, you can see the hull shape is very similar, has the same 8 inch hatches (which were brand new at the time, which are pretty standard across the line now). We absolutely loved our Oasis, and put thousands of miles on it.
The seats haven't changed a lot.
The Mirage drives are probably what we call V1 mirage drives, they can be updated to V2 I believe with a kit from Hobie, but why bother if they are in as good a shape as they look. Those Mirage drives alone are worth $400 to $450 each (new they are around $550 each), so $1200 for the whole works in a really good value (and they will still fit in even their newest mirage kayaks). If you do update the Mirage drives I would definitely update them to the bigger Turbo drives, basically the upgrade kit replaces most of the wearable components, but those drives look in great shape (look to have never been used), I would just use them as is for a long time.
As long as the rudder works ok I wouldn't bother updating it to the twist and stow.
I would definitely water test the boat before buying, and inspect the hull carefully looking for cracks (especially around the drive wells). Once the hull cracks, there is not much you can do to repair it (it's basically scrap, and usually can't be repaired easily). We have seen quite a few people on here (this forum) buy what they thought was a bargain on craigs list only to find out the hull leaks and the hull is scrap and can't be repaired on an old out of warranty or dis-continued model.
Great way to step into a Hobie (hands down the best recreational kayaks on the market). Once you start using the mirage drive you will never want to own anything else.
Welcome to the Hobie way of life.
Bob