A lowly dispatcher? Don't do yourself down, you guys do a sterling job.
As for ATPLs, one assumes you are going to do them slowly? One also assumes you have read the pages on the "Growing Evidence Of An Upturn yaddayadda" thread?
If you are going to press on then under normal circumstances people can only give informed decisions on 1 groundschool, because that's all they have attended. In light of this I am recommending Bristol gs. They are superb, and will get you through.
Good luck whatever you decide
CC