Eureka Seven, Code Geass, Strawberry Panic, Linebarrels of Iron, Gundam 00
Try those out.
I listed Linebarrels...... but, I dropped e7 after like 20 episodes... but watched all of E7 AO which was bleh, Code Geass is forever in my backlog, I d/l it like right when the dvd/bd releases came out and still haven't watched lol. Gundam.... no thanks too hard-core mecha for me.
I watched like the first episode of strawberry panic way back when, maybe I can give it a go. I am watching Reideen right now, it's ok, but the recycled (transformation/power up) animations are wearing on me
I think I must subconsciously exercise my masochistic tendencies by watching mecha anime series lol, I have seen plenty of them but the list for ones I might actually recommend is very short indeed.