Too late, but I will chime in anyway
I replaced both toilets in my home last year, and researched the dickens out of it first. Via personal recommendations and web forums (there is a bathroom forum on THS just like the laundry forum) I also concluded that Toto would be the best choice. That was until I priced them at the only two places here in this burg that sold them. I wound up with one Toto, the "Clayton", and one Kohler, the "Cimarron". Both are elongated bowl, ADA height. One cost $400, the other $200. There is barely a dime's worth of difference in how they perform. From personal observation, IMHO, these things are important: 1.) the three-inch (or 3-1/4") flush valve in the tank. (the "flapper") This lets a bunch of water out in a hurry. 2.) the wide, glazed trapway. (the water passage from the bowl to the drain). 3.) the "siphon jet". This is a squirt of water from the front bottom of the bowl which blows the contents down the trap.
Both of these toilets have all these things. Toto marketing calls the Clayton (and the Drake, and others) "G-Max". This actually refers to a quicker-filling tank supply valve. Lower-cost Toto products use the same big diameter flush valve, but take longer to refill the tank. These are called, IIRC, "Power Gravity". The Cimarron, "Class Five" in Kohler marketing speak, has the big flush valve and takes longer to refill its tank than the Toto. Because of its usage of standard parts I could buy a quick-fill valve for the Cimarron and it would fit.
Both of these flush very well and are difficult to clog. They are not, however, clog-proof. I would recommend either without hesitation. Toto's are found (at least in Tucson) at snooty decorator shops. I got the Kohler Cimarron from Home Depot.