I'll take Gundam Epyon. (I remeraber having fantasies as a kid about me using it to destory my school.)
I'll also take the Knightmare Gawain. (I'll need a good-lookin' gal to pilot it while I laugh maniacally, bark orders, operate the weapons, and stroke my ego to no end. )
I'll take Goldorak/Grandizer, it's my favorite childhood mecha in company of other Go Nagai mechas like Mazinger, Getter Robot, Jeeg and finally the Wing Zero from GW and an Aestevalis from Nadesico.
Speaking of parody mecha, I'd want Elephangar from Macademi WAsshoi!, the sad thing being, Tanarott would beat the crap out of it with her power fists, before it even got to do anything
To quote KaiserNeko (in an Anime Counterpoint podcast), "Roger Smith, you didn't have to smash that building, but you did it anyway because you're that awesome"