Something with a bit of MindFuck? Try FLCL, it's from Gainax ang Production I.G
And it revels in the same ambiguity as Evangelion does.
If you're really an enthusiast for nostalgia, watch all UC Gundam shows. (MSG, MSG:Zeta, MSG: Double Zeta, MSG:Char's Counterattack, MSG:F91, MSG:Victory...