I will at least tell you about some Totos you should consider. All the Totos I list meet your criteria for ADA (or "Universal") height, and are: (a) Reliable; (b)gravity toilets with (c) a GREAT flush.
The original Drake: CST744SL: ADA Height, 1.6gpf, Water Spot 10 3/8" x 8 1/4"
The Eco Drake: CST744EL: ADA Height, 1.28 gpf, Water Spot 10 3/8" x 8 1/4"
Drake II: CST454CEFG: Universal Height, 1.28 gpf, Water Spot 7 1/8" x 9 1/8"
Drake II 1G: CST454CUFG: Universal Height, 1.0 gpf, Water Spot Size not yet available (different-looking tank and trip lever from the standard Drake II)
Ultramax II: MS604114CEFG: One-piece toilet, Universal Height, 1.28 gpf, Water Spot 7 1/8" x 9 1/8"
Original Ultramax: MS854114SL: One-piece toilet, ADA Height, 1.6 gpf, Water Spot 10 5/16 x 8 1/4
Eco Original Utramax: MS854114EL: One-piece toilet, ADA Height, 1.28 gpf, Water Spot 10 1/4 x 8 1/4
Hope this helps.