I recently purchased a Golf Achiever II system. I am very happy with it. I already had a very nice hitting mat, so I had to purchase a 10' x 10' x 10' cage, an impact screen, a projector and the simulator itself (with software included for 52 courses and driving range software). My son and I have used it and found the system to be helpful and fairly accurate compared to real life golf course scenarios. This simulator/software package was around $1500 plus around $1500 for all the other stuff I purchased. If you have any questions, just message back.

I have one in my basement and love having it. There are quite a few that are in a more acceptable price range. I have the Protee, but a good place for information is: http://golfsimulatorforum.com/

Happy to answer questions about mine if you have any.

Those look awesome. I wish my house was big enough for something like that. Golf year round would be a dream.