MChristo -- sorry I missed your last post.
Drake II is a different design from the Original Drake; indeed it was originally called something else, but marketing saw how popular it was and gave it the II moniker to tie it to their most popular toilet, the Original Drake. It has Double-Cyclone flush for better rim wash, CEFIONTECT, and is in Universal Height (ADA height). It has a modern-looking tank. CST454CEFG
Eco Drake is the Original Drake toilet, but with a bowl that works well on a 1.28gpf flush (the old Original Drake was 1.6gpf, and is still available, but the 1.28 works basically as well). It is a good value, with a great flush, but its standard version is at regular height and doesn't have CEFIONTECT. Either Universal Height or CEFIONTECT (but not both together) are available if you want it, but for extra money. CST744E for the basic one, CST744EL for the Universal (ADA) height, CST744EG for the CEFIONTECT.
On the Original Drake, there is a "new tank option" that is only available in 1.28gpf. It looks more traditional than the regular Original Drake tank. CST744EN for the basic, CST744EGN for the CEFIONTECT, and CST744ELN for the Universal (ADA) height. "N" for "new tank".
The CST454CEFG, the Drake II, is one of the most popular toilets in the Toto line. It gets great reviews on the online sites, and is often the most-sold toilet of any brand on one of them. It's a great value because it has CEFIONTECT, Universal Height and the double-cyclone flush all standard. It flushes well, rinses well, and is made well.
That Drake II also comes in a 1.0gpf version, CST454CUFG. If that's not what you want, be careful that you get the number right (E for 1.28gpf, U for 1.0). That CUFG has a different-looking tank than the others. It also has a more-complex flush mechanism. No flapper, instead a unit that sits over the flush hole that looks a bit like the unit on the dual-flushes. I assume this is to more-precisely-meter the water. Haven't heard any complaints about it. One benefit of Totos, however, is that most use simple, readily-available replacement parts, and this unit is a bit more complicated than just a flapper. So if you like the look of the tank on the standard 1.28gpf Drake II, then I would go with that.
PS That Maris two-piece toilet in the video Terry posted seems to have been discontinued, or is at least only-spottily-available and has disappeared from the Toto web site. The Connelly has the same flush system and does appear to be more-widely-available these days, so we will see how it goes.