I would imagine you could build a dang nice house for 150k to 200k depending on the area and how smart you are with the money and building of the house. The only question would be, are you up to building it yourself? Are you going to hire contractors to do any of it? Do you know people who do a good job, yet work for cheap.
You should depending again on the area be able to make a phat profit if you decided to sell it too. But that depends on if you build it well. You've also got to take into account the government and the taxes, permits and hoops they're going to make you jump through. There is a lot more to this than you probably realize. It's definately a worthwhile venture. But do you have what it takes to make it work?
I'm a real-estate investor, so if you have questions about this, I'd be more than happy to talk to you about it.
Aaron2