I heard that the series was taken much farther than the american version. Where would I go to get this continuation?

http://www.tvnihon.com/

they're currently releasing the japanese version of all headmaster, masterforce, and victory w/ english subtitles. you'll hafta use either bittorrent or IRC to download the files though, you can learn more about bittorrent @ www.bittorrent.com and irc @ www.mirc.com

if your in europe you can get subed and dubed box sets for headmasters and i think masterforce also i think voctory is in the works

headmasters and super god masterforce are out on official dvd in the uk and victory will be out before christmas

TF Archive has Manga Translations, wich for the most part are in continuity with the animes.
http://tfarchive.com/comics/japanese/

If you are rich then you could buy hte entire japanese TF DVD boxed sets but:

1/ they are hard to find, even in japan.
2/ they are VERY EXPENSIVE (the g1 series thats the exactly the same as the usa version is almost twice as expensive in akiba stores)
3/ They stripped the english language tracks from even the original english dubbed shows, so the only language track is JAPANESE.