Best place to find experienced, reliable, and fast WP multisite developers/tech folk?

Greetings,

We're launching a sports network of collegiate sites using WP multisite as the backbone.

We need an experienced developer/tech dude to help us implement various things. Demand will fluctuate, so am looking for someone that's reliable and responsive to help us out and this could develop into a full time position later with equity in the venture. I suppose we'll either pay an hourly rate or pay a monthly retainer.

Any ideas as to where's the best place to post a want ad for this sort of thing and not get riff raff? :wink:

Thanks!
Ray