You just need 2 accounts and have both set to different payouts.

Now just hard code in the top JV's clickbank id in the sales page. Now you will also need
to clone your site for them.

Its very easy to do. Or clone the site and have its as a sub domain.
Charles,

can you have multiple clickbank account... is it just like having multiple Google Mail accounts?

I'm not fully sure of the hard coding or sub-domain route and would echo Da' Genius Marketer if you could explain this process.

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Or you can manually send them a bonus check or present at the end of every month. Sure it takes more effort but it will be more appreciated too.
Vince,

yeah, I can appreciate this option - just get into a process of writing out checks on a set day of the month.