I've played the Tron pro and it didn't do much for me, but for under $4000 i'd consider it. For me SM is streets ahead of Tron.

ETA..What do IM and SM home use only go for at the moment ?

+1 sm is a far better and deeper game than tron.
I guess it's what you are prepared to pay for one and how much you want one.
I would reckon 5-5.5k for a spidey and around the same for a IM. You might find one cheaper, who knows.
There is a huo IM on ebay atm for $5250, I think that's pretty fair.
There is a guy in cairns selling a sited spidey for 5.5k neg but apparently the game is in excellent condition.
If Avengers isn't made or is made and is a shitter I will be chasing another sm.