Thumbs up for AIKa! Despite all the flack it gets (which it probably deserves by the way) It's really good for what it is, above average animation and nice attention to detail on vehicles and firearms - not to mention overall pleasant background and color work. And a surprisingly pleasant soundtrack with some really decent vocal tunes. 
Now. Green Green on the other hand 
Heh, with anime at prices like this I normally figure I can probably watch it once and if I don't like it just sell it on the internet to make back my cost. I'll probably watch Aika first though based on your recommendation.
Though I've got quite an anime backlog because I couldn't help myself last night and swung by for a couple more DVDs and then hit GameStop:
2013-10-4 Misc Finds by
xelement5x, on Flickr
Armitage III OVA
Armitage Dual-Matrix Movie
Etrian Odyssey Untold: Millenium Girl (3DS)
Dragon Blade: Wrath of Fire (Wii)
Finding these Armitage DVDs brought nice nostalgia of all the old Pioneer stuff from back then. Actually, the disc art for the Armitage OVA is kind of cool, it's designed to look like a PCB but all the little IC chips have funky text on them that look like in jokes. One is emblazoned with Pioneer LDC (LaserDisc Company) and another is an AIC processor. Dragon Blade was also like $3 so I figured it was worth a try, seems like it might be fun.