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I play BattleTech.
It's the only game I want to play, really. The rest are compromises and time-killers.
While I'm not going to say it's the route that will give you a gundam-esque experience, if you enjoyed any Mechwarrior title, HBS Battletech, Earthsiege/Starsiege or the Front Mission games before they decided to turn them into action games, and want a game that can allow for tinkering and customization, then it's worth looking into.
Also, it's a fluffy wargame, first and foremost. It's best served as running a mercenary unit and extended campaigns. It is not Fiasco (Thank god, never again)
Though I'd take a rain check on the most recent RPG system unless you have your heart set on playing the most advanced, modern eras. TPTB got overzealous and made what could have been the most streamlined system into one that has painfully slow chargen, an unapproachable equipment section, and require looking multiple places on the record sheet to determine what you need to roll. 2nd edition has holes but is way more streamlined. 3rd edition feels more like a proper RPG on it's own, but lacks synergy due to using 2D10.