Must. Keep. This. Thread. Alive!!!!
Dropping a few of my suggested mecha anime for those that wanna try, they are in no particular order, all awesome in either animation, or story, or both:
1. Tengen Toppa Gurren Lagann
2. Top wo Nerae! Diebuster
3. Macross series
4. Gundam series (not the Gundam AGE or Build Fighters plz)
5. Ginga Kikoutai Majestic Prince
6. Aldnoah Zero
7. Code Geass Lelouch of the Rebellion
8. Neon Genesis Evangelion, Movie Series 1.0 - 3.33
9. Mazinkaiser SKL OVA
10. Fafner
11. Full Metal Panic!
12. Blue Steel of Arpeggio ARS NOVA
Please give these a try