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The tricky thing will be that although he has written brilliant articles for you which are well worth what you have paid, he hasn't got much of a paper trail online, or so I assume. If he's prepared to push himself he could look at a cent a word to start off with and try to work up from there. Word gets around about quality, so if everyone likes his work as much as you do, he can look to up that.

Starting a thread on here is one way to start, he could also try some freelancer sites and content services forums - though I must admit these can be hit and miss, and he has to be unafraid to ask for down payment on big projects. I know of a friend who offered a package of services on another site, including ebooks, blogs and so forth, so if he's prepared to be versatile he'll only increase interest.

I think postiing a service site right here would be the best option.
After all your not going to be succesful unless your willing to give it a try