Spider Mite Removal on Vegging Plants: Predators, or Systemic Insecticide?

Hello all,

I'm on my third batch of plants, and my clones came with spider mites. I've been fighting them off with pyrethrin, but I need to eradicate them completely, and I don't have a lot of spare cash to try different techniques.

So should I go straight for predators, or should I try a systemic insecticide? If so, which one should I get? I'm in Canada.

I'm leaning towards predators myself but I'm concerned about not getting the right predators, and they're risky-expensive for me. But if they'll work the best, I'll go for it. Or if anyone has any experience with a systemic insecticide in Canada, please let me know.

Thanks!

-Jessica

spinosad and sns-217 (rosemary oil)
Spray one wait 3 days spray the other.
plain water with a drop or two of plain soap sprayed all underneath is good too.

stay away from floramite/forbid/avid. all nasty chemicals that leave residue and stay a long time.(they are illegal in my state)

Pred mites are good sometimes, bad others. they are best outdoors.
sometimes they get real picky and won't feed heavily on the mites.

Green Cleaner is great too. 3 applications a week apart usually insure their demise.