Cache arrangements for one page multi-site?

Hi Guys.

Could you please give advice/opinion on what cache arrangements (plugins etc) might be best for a :-

"Multi-site install that provides each 'user site' with a one page 'forwarding service' facility".

After individual preference set-ups, these sites should be called upon to only to service 'call to action' forwarding buttons.

Obviously I wish to reduce server usage to a minimum!!

The general idea is here:-

I understand a plugin has recently been issued by one of the original developers?

Thanking you in advance.