I like the idea of 5 because it strikes me as most similar to the most recent version; you want to go crazy maxing out, more power to you. Sometimes I'll play a bunch for a few weeks/months, but also go for long stretches where I can't/won't play or do more than just log in to check on an enchant, and I'd hate to be unable to do anything worthwhile, enchant-wise, during those latter times.
Also, just because I love that someone said this, here's a reply to a krakii post from the officials:
krakshot copy.jpg