Last year, as part of our basement finishing, I installed this American Standard Cossette toilet. One-piece, elongated, comfort-height, dual-flush, concealed trapway (smooth sides).
This toilet performs very well, while using the least amount of water. So well, that I just bought two more to replace upstairs toilets (originals from the builder, need to be replaced). Turns out that they're on sale at Rona - down from $389 to $330, and we also got another 15% back at the cash register in a gift card.
I've been doing my own plumbing for years, and have been studying toilet design and performance since I re-did my powder room back in 2011... One good measure of toilets is it's MAP score. MAP is a test where they keep increasing the amount of (artificial) crap in the toilet until it doesn't flush anymore. If you buy a toilet, you should get one with a 800 (grams) score pr higher. Hmmm... The MAP test kinda sounds like a management principle - keep piling on crap 'til it doesnt function anymore...
Feature-wise, if you wanted more,you'd have to go to one of those Japanese Toto toilets with the heated seat and warm water wash jets. Handsfree mode! They have one in the staff toilet at Canaroma on Weston Rd if you want to try. Mrs FLSTC indicated some interest, but I quickly shot that down by saying that We did not have an electrical outlet near the toilet in the basement...