I'll add TWD pro (as a biting game) it's wicked fun.
I just got AFM sitting next to IM and they are both excellent choices (one more game!!)
I owned STLE and feel like it's more of a long playing game like SM and you really need to play 10++ minutes to see a lot of the depth. It's still great pin bit not a quick brutal pin like IM/AFM/TWD. ST is more of a long game and games like Tron/IM/TWD/AFM can be long but not as necessary to be long game.
I have TNA on my wish list and on order but thinking much like you that it may be too much of the same same.
At least AFM has a martin attack mode to mix things up.
Bottom line I voted IM and would add TWD (pro) and AFM.
I prefer TWD pro (cheaper and also less things to stop the clock like the crossbow) ant the station ramp is a lot more smooth than the lifting ramp.
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