SGI 4D Power series question

In college I used to program on an SGI 4D power series using Irix 5.3 and the FORMS libraries to handle the gui.

I still have all my old code and Im interested in getting it up and running again. What would be a good computer to devop on ( on that I would have to buy myself)
thanks for the input.

my email is stevegardner@sprintmail.com