The worst thing about Chaos Bringers is their total immunity to Photon Blasts. I hit one with a Golla blast, for instance, 0 damage. Ugh. I haven't tried Grants/Megid on them in awhile, though. (EDIT: Heh, you said Dark Bringers... haven't even met those yet.

)
As for elemental techs: hrm, tough choice, but I'll have to go with Foie techs, as they are your go-to techs for taking out the grunt enemies in most levels. I particluarly use Gifoie a lot. I like Gifoie (I didn't use to) because it hits a very large area and does close to the same power a Rafoie blast does, while using less TP. Also, my FOnewm recently grabbed a Lv. 17 Gifoie disk and I am enjoying the nice new Gifoie animation with that character.
Gibarta I use more often now... I used to dislike it because it used so much more TP than Barta, but the ability to freeze is invaluable. With three characters with high TP, I can afford to use it more often, even on enemies with high EIC (like Ultimate Sinows - wtf is the deal with them anyway, with no pain animation?). Gizonde, of course, is the go-to tech for Mines; clearing out a Mines room with my Force is pretty simple. Gizonde, a quick combo with the Supressed Gun on whatever Gilchic I happen to point at, another Gizonde, etc... anyway, I don't see the use of Ra techs beside Rafoie. Rabarta only seems useful when you're surrounded, and then you always get knocked down by the enemies that didn't get frozen (often at the same time, which always sucks :ermm: ). Razonde seems like only a slightly better Gizonde, to me. *shrug*