Panama is a great choice, and you can own land there without all the problems of owning landing in Costa Rica.
These guys are crazy - $250k is not a ton of dough - but it is a ton of dough if you are making it without paying high taxes and living somewhere much less expensive like Panama or Costa Rica.
If you have the balls to make that type of move, DO IT -- you will never regret it. You may want to be careful about renouncing your citizenship right away. Go check it out for 6-12 months and see if you like, then move forward.
If you go to Panama, PM me and I will give you some great places to check out.