I've been using private label content for over 2 years now and highly recommend going only with quality plr subscriptions. PLRpro has gotten very good feedback in other forums.
I personally use infogoround. I did a short review of infogoround:
Read Here
I also wrote an article on rewriting plr content:
Read Here
Thanks for the heads up on plrpro, I'll definitely take a look for $1.