If Magento is hosted on a shared server and 'PageCache powered by Varnish' is out of the question, would anyone recommend some of the other Magento page cache plugins like:

Booster: http://www.magentocommerce.com/magento-connect/performance-booster.html

Zoom: http://www.magentocommerce.com/magento-connect/zoom-full-page-cache-1742.html

Nitrogento: http://www.nitrogento.com/

Brim: http://ecommerce.brimllc.com/full-page-cache-magento.html

Are they all 'just not worth it'?, is there one that stands out from a bad bunch?

Cheers,

Les