Trish - Any vetted trainer is slow enough. I doubt anyone knows exact speeds - it's not like we stand around with radar guns (although I've had a few planes I'd have like to know the speed of).
I'm guessing most fly well as low as 25 mph which is pretty slow for a plane and they land a lot slower than that. Top speed for most trainers is going to be around 60 mphish.
I have orientation problems which is different than depth perception or color blindness. The easiest plane I've ever had to keep oriented is my stik which has a white wing and a black wing. Doesn't matter what the weather is or what the sky looks like.
I've uploaded several files of the plane in various attitudes and in all it's pretty easy to tell what's going on.