Kohler Memoir sink:
You may also have a problem matching the white colour. Kohler Memoir toilets are all ADA/Comfort Height.
Even the rounded lines of the Transitional Drake tank lid may clash with the sharp lines of the Memoir vanity.
Don't go form-over-function. A great looking toilet that has a lousy flush is no bargain.
With my ADA Drake I use a slim Kohler seat (3/4" thick at the front foot pad.) With my regular height Drake I use the thick Toto seat (1+3/8" thick at the front foot pad.) 14+5/8" (bowl height) + 1+3/8" (seat height) = 15.0" I wish that a regular height toilet was 15.0" high before a seat is added. That is what I consider ideal. ymmv. A 15" high bowl allows the use of a 1/2" (hard to find), 3/4" (plastic), 1" (plastic or wood), 1.25" (plastic or wood), 1.5" (wood) toilet seat.
Give us a little time to do some research. We might be able to come up with something, although we probably can't guarantee whether or not it has a good, or great, flush.
The Cadet Pro has a nice flowing trap way and is 15" high. I wouldn't buy it at HD, Lowe's or Costco, though. And since it is a "Trades" toilet, it may not be that good. You'd have to ask Terry.
Me, I'd just get the Drake 1.6gpf in regular height and add the thick Toto seat. A matching tank lever will cost you, though.
You have a lot of research to do and show room visiting.