I vote Iron Man, you can get it cheaper than a TNA and can get it right away. There will be more TNAs for sale on the secondary market eventually as more and more people get theirs if you ever decide you want one later on. I don't really get the adrenaline rush from Star Trek that I do IM and TNA. I mean, you could always put in a deposit for a TNA and then get an Iron Man now with the rest of the money.
--Scott