Most big affiliate networks are pretty good. I prefer Clickbooth and Hydra, but Market Leverage is great as well.
Lately, I've been finding some smaller ones as well. One was called iAffiliate, I think. They pay out 100% on the front end of every offer, which caught my eye, but they don't have very many offers.
I did see one offer that caught my attention, though. Has anyone else ever seen an Overstock offer? They have one and I thought it seemed kinda unique as well.
In any case, don't worry. ML is a good company, and you'll get your money. Most networks realize that robbing an affiliate of $2K now and losing him won't make them as much money as just taking their cut from an affiliate they have for two years.