However, I'd bank on seeing some type of 'Sentrybuster' armor in the future. Seems like Tony always builds a 'buster' to combat the more powerful heroes/villains on Marvel earth.
Tony defiantly has some trick up his sleeve for Sentry I'm sure, everyone was surprised when Tony revealed he could absorb Sentry's energy. There is no telling how much he has learned about The Sentry now.
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When he fought in the 'Hulkbuster' for the first time, he didn't lose, it was more of a stalemate. When he battled in the 'Thorbuster' he eventually lost, but it was a damn good fight - and against King Thor, no less. Finally, when he stood against WWH in the second 'Hulkbuster'. Sure, he was beaten [just like everyone else], but he fared better than most, imo.
So, his track record in 'buster' armors is pretty good imo, considering the powerhouses he's battled in them. *shrugs*