Grizzlebear, who could hate the Tama-Go? It's my favorite English version.
Anyway... The ultimate Tamagotchi is the 15th Anniversary one. I don't have one but they are said to be the best Tamas yet... but they only come in purple and pink... XP
The iD is very similar to the Tama-Go except in color. The iD L is pretty good but it only has two games and only a few things to buy unless you download. I have one and it's really fun, despite the fact I don't have downloads for it, and it comes in many colors besides pink and purple so try one of them.
The TMGC+C doesn't have any of the newer characters, so don't get it if you want newer characters.