Hongfire has the torrents split. The first torrent is 1-25 and the other torrent is 25-50. Boxtorrents, Hongfire, and KickAssAnime are as close as you'll get to Gundam Seed. I recommend getting the episodes from KickAssAnime since their translations are perfect (they used the official script of it, not any subbing groups scripts). All the subbers of Gundam Seed messed up the characters names. Example: They misspelled Cagalli as Kagari. Athrun's name was spelled as Asuran. Yzak was spelled Issac. You get the idea. HongFire

EDIT: Also, if you want to have a one subber collection, then go to Seed-Fansubs channel. I believe they have all but 2 episodes on their bot. Plus, they have the Gundam Seed OVA (it was basically showing what all the characters were doing after the war was over).
Server: Rizon
Channel: #Seed-Fansubs