Removeable mobo trays are becoming a thing of the past, hard to find. It's not a big deal with modern psu placement, horizontal at the top of a tower case. Visit
www.antec-inc.com and check out their offerings, particularly the VAR line, w/o psu's. A SX600II would likely suit your purposes well- excellent stout case with great cooling and features. Then do a Google search to find a vendor, check 'em out on resellerratings.com...
If you just can't live w/o the mobo tray, then your options are limited to mostly high end aluminum, maybe a few of the inwins (do not buy an A500!) and the 758A from A-Pro. I haven't personally used one of these, but they're obviously stout (1.2mm steel), big, well ventilated and have the tray you want... very plain-jane....