They are pushing the Origins edition, which comes with some skins and downloadable goodies for other Blizzard games, but if you don't care for for those just get the basic version.
cdkeys also have the Origins edition for $59CDN here
I've been having fun playing vs the Ai. Although they will have to make some adjustment to the Ai. The easy and medium difficulty is way too easy and the hard mode is almost impossible to beat.
Good way to learn the maps though.
I doubt I will get the game however. Just way too fast paced for my taste. Also play against humans with random people is a recipe for frustration, unless you practice 8 hrs a day to become good at this game and carry the team, and know the counters to each and every characters in the game.
If you have a group of friends to play with than it can be fun though.