*cracks knuckles*
Stay a while and listen
Sorry about the last response the world seems to be working against me today.
I have quite a few that I have enjoyed you mentioned quite a few good ones yourself. I would recommend watching the Evangelion films after you have watched the series, it gives you an alternate ending and storytelling aspect.
Mobile Suit Gundam
My absolute favourite series.
Probably one of the longest running Mecha series from japan it started in 1979 (Soon to be 35 years old if you include the manga) and is still going, Build Fighters is getting a second Season and a new Series with a New Universe is also going air later this year (Gundam Reconguista in G). I would recommend you start with Mobile Suit Gundam 00 (Just a word of warning with 00 it's a very modern Gundam series set in the AD future, you may feel a little let down on the design of the other Mobile Suits in the older series) SEED, Wing + The OVA series or Build Fighters. The Gundam series itself is very involved and to honest involves a lot of politics as well as drama, it's not called a 'space opera' for nothing.
Armored Troopers Votoms
An very old but very classic series.
Diebuster & Gunbuster
Diebuster (Top o Nerae! Gunbuster) is also a must watch quite a bit older than most, the production company ran out of funds to colour the final episode but years after it's release it became a cult classic.
Gunbuster is the sequel to Diebuster you will see a little bit of Tengen Toppa in it.
Blue Gender
Classic 90's Mecha series a lot of gore and blood, more for the shock value than story telling.
Patlabor
A film series about a police force with a gigantic robot, well worth a watch.
GaoGaiGar
Betterman (a spin off of GaoGaiGar)
RahXephon
Reideen
Aquarion
Aquarion EVOL (set in a different time period)
Linebarrels of Iron
All mostly fall under the shonen style gigantic mecha sub-genre.
Cyborg 0009 (more of a 'human' robot series)
Brain Powerd
Escaflowne
Mazinger (managed to keep it's 80's visuals and style through the years)
Macross
Another classic, spans over many years has quite a few OVA's, Series and Films.
Casshern
More likely to get a hold of the rebooted series SINS, which is also a 'human' robot mecha series.
Wildcards Just throwing it out there because why not?
Medabots
Megas XLR






