For the taller grass, Chasmanthium latifolium. For smaller grasses, look at Luzula varieties, Sesleria varieties and Hakonechloa varieties.

I agree with donn's recommendations. For smaller varieties, you might also want to look at Mondo grass, Ophiopogon japonicum. It's not really a grass, but looks like one and thrives in the shade. Has deep green color and weeping form. Also, there are many varieties of Carex spp. that thrive in the shade. I particularly like Bowle's golden sedge, C. elata.

So I gather that you both consider this a shade area and are not concerned about the summer late afternoon high heat??

Chasmanthium latifolium will be fine in the afternoon sun. For 'tallish' you might also try Calamagrostis brachytricha which will also take a certain amount of shade &/or sun.
On the shorter side of things, you're right, it might be a bit hot for the Hakonechloa ~ you could always try a bit and see how it works out. You just never know with these things. What will work in one garden won't work in another. There are oh, so many variables. An alternative that will work and give you the same colour effect is the variegated foxtail grass ~ Alopecuroides pratensis 'Variegatus'
Any Sesleria spp. will be fine in sun & part shade as will the old stand-by, Phalaris arundinacea aka, Ribbon Grass. For those tough spots it is hard to beat! I have some as a disguise in front of my air-conditioner. Soil is dry, it gets minimal sun & always looks nice and fresh. Some of the carex spp. might also work for you. Carex muskingumensis is a nice medium height and Carex glauca will give you a nice blue-grey look, etc, etc. Actually, lots of choices ~ all you have to do is make up your mind! :o)

Thanks a million!!!

My Chasmanthium latifolium only gets 2-3 hours of sun, but its in the heat of afternoon and it has thrived. It seems to be one of those plants that can adapt to widely varying light conditions. Mondo grass can take some sun as well, as long has it has plenty of moisture, mulch, etc. Same is true for many Carex varieties. Hakone grass does not like strong sun, however, and might burn with a few hours of hot afternoon sun.