Simulator envy is a terrible thing.
I use a Logitec Extreme 3D pro joystick and a laptop. That's it. I have no permanent desk space at all.
If the simulator saves you one go-around at $99/hr that's about $10. If it saves you a couple of hours extra in the pattern (think PSL, PFL, flap-less landing, 180 degree glide approach, go around, engine failure at take off and most specifically memory item checklists) then it will pay for itself quickly, I imagine.
If (and it's a big IF) it saves your life by allowing you good judgement about acceptable approaches and departures due to terrain and weather considerations, priceless.
If it teaches you not to look out the window so much and skip the pre-flight checks, not so good.
As a minor aside, I have written elsewhere in this thread (e.g. Post #20) about my comparisons between my crappy freeware simulator and an actual flight. I'm going through all of that again this month after a long time away from actual flying. Queue another invoice for charts and stuff.