2. Byrne/Romita Jr (very short, very good, kind of bittersweet that JR Jr left so soon though. Paul Ryan is a good artist, but it wasn't the same for me when he took over) 

And I don't have a fifth entry.

I liked him building AIM up as a big threat, but that seemed to fall aside after Michelinie / Layton returned and they brought back Justin Hammer and introduced The Ghost (not bad developments by any stretch).

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Rebecca, I included that run by Busiek and Chen (and latterly Roger Stern), in my picks. Good stories that built on the work of John Byrne and Len Kaminski (and wisely ignored the horror that was Terry Kavanagh's run) with the use of the Dreadnoughts, Black Widow, Firebrand, Whiplash, Spymaster, The Mandarin, Fin Fang Foom and Ultimo as villains.

I gave up on Iron Man a few issues in to Joe Quesda's run, and on Marvel in general around 2000 / 2001.

After the goodwill that Heroes Return had generated with The Avengers, the FF, Iron Man, and Captain America was tossed out the door by Bill Jemas, I soured on Marvel

The late 90s Iron Man is good up to the end of the Busiek/Stern/Chen run, the Queseda stuff that comes after isn't my cup of tea at all, and i wonder how much it was done by Joe Q because of the bad blood between him and Bob Layton at the time (because of what happened at Valiant when Joe Q was the artist on Ninjak, if i remember well Layton fired him for being late or messing the job one way or another). They finally put it behind them at the time of the first Iron Man movie, but in the late 90s and early 2000s they were not on speaking terms.

Fraction/Larrocca: I liked what i read of it.

Some of the mini series by Michelinie & Layton are good too, starting with Iron Man: Bad Blood in the late 90s (around the end of the Busiek/Stern/Chen run and the begining of the Joe Q one), and the more recent (2013) Iron Man #258 1-4, with Dave Ross on the pencils. In the 2000s there were other mini-series and one-shots that are not on the same levels, and if i understand well, not satifying for the authors, but those two are good. Dave Ross inked by Bob Layton is pretty fine! and Michelinie and Layton gave us here a complement to their second run. Very good stuff.