Crisis on Infinate Earths

[MIDNIGHT RAIDER]

When I was in the shop the other day I noticed that there were three editions, ( I guess previous years) of this "Series".
Which one would you suggest?
I hope I'm not being too vague. like I ssaid in anotehr post , I've just recently started reading comics again, and never ereally have been a big fan of the crossover multi-book kind of marketing. But I don't mind this so much, because the stories are so compelling.

[Wildfire]

There isn't really a lot of difference... the more expensive verisons have some extra (sketches, commentary, etc) but the comics themselves are the same.