The 2014 models run about $2850 plus tax and they hold their value well. Any changes from 2012 to 2014 are relatively minor, so you're getting essentially the same boat. In top condition, it sounds like you're getting a pretty good price at $2k, but this is not to discourage you from using your negotiating skills!
You mentioned no extras. If you are getting this from a dealer, you may want a few of those extras and you may get the dealer to throw them in or at least offer a discount, since Hobie extras are somewhat expensive. There are three accessories that are most important IMO:
1: A cart
can make moving this heavy boat around easy and lets you roll it right into the water without the need for a launch ramp. For most applications the basic wheels are more than adequate.
2: If the boat doesn't come with a large rudder
, you should get one. It's like getting a handling package for your car -- increases low speed maneuverability and requires fewer steering corrections in windy, choppy water. It does come standard on some models now -- not sure about the Oasis.
3. ST Turbofins
do for performance what the large rudder does for handling. Even the ST fins (smaller, less expensive) are a nice performance improvement over the standard fins. My 81 year old friend (who is pretty fit) uses the Turbos so I'm sure you'll be able to handle them with no problems. They increase speed, acceleration and efficiency. If you get a sail later, they, along with the large rudder, will compliment the sailing in the form of larger "daggerboard" and better helm control.
I'm also a big fan of the "i-comfort" sat pad for my bony butt -- extends my comfort range from about 45 minutes to over 2 hours easily. But not everybody needs this and it isn't as important as the other items. You can always consider this later if you find it appropriate.
We're looking forward to your first report with your new boat!