Netepic is based on the SM/TL mechanic, but has some important changes. It came about when Epic40K was released and a lot of the "old guard" decided they did not like the new rules. I haven't played, but the descriptions of the changes I've read sound as if it is a vast improvement.
Epic40K was the 1997 (?) release from GW. It streamlined the mechanics and resulted in a much more fluid game. IMHO, it was a big improvement. However, while streamlining game play, a lot of the fun, fiddly bits that people liked were "abstracted" resulting in many people feeling that it lost a lot of flavor and character. It also had problems on the business side with marketing support. Those two factors combined to make it fail as a game line.
Epic Armageddon (E-A) is the latest attempt to resolve the issues and re-release the game (scheduled for November, 2003). It's in the final playtesting stages, and you can download the rules from the Fanatic Games website. Personally, I think it is the best ruleset of the three from GW (can't comment on Netepic). It put most of the character of the units which had been abstracted out of the system back in, while also keeping the fluid game play. In addition, Jervis Johnson's professed marketing plan and release schedule sounds fabulous to me.
If you are starting from square one, I would recomment E-A.
You will find proponents of all the systems on here, but unless you have a sizable game group that agrees to play with one of the other rulesets, you're probably not going to be able to find a game outside of the E-A stuff. Of course, until it's actually released, that may be a bit tough, too.
_________________ Neal
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