I've been pondering a Pandigitial R90L200 'Multimedia' 9" this week for my PDFs and color books. They are around the $180 range now.
1) At least 9" screen size.
Yep
2) Color display.
Yep. Though the resolution has me wondering.
3) Matte finish screen.
I think its glossy.
4) Cost.
$180ish. Barnes and Noble had the cheapest I could find.
Anyone with one of these? The threads about it are old from when it was twice the price. Maybe its a steal now

.
5) Other.
Android OS.
Hackable (though they don't seem to have done much of it over on slatedroid.)
Wifi.
SD slot.
Questionable company and support?
Rumors of a new model coming out (which explains the price cut.)