Performance expectations with a Linode upgrade...

We are now being offered a choice to upgrade an existing Linode:

Resources affected:

RAM goes from 1 GB → 2 GB

Transfer goes from 2000 GB → 3000 GB

vCPUs go from 8 vCPUs → 2 vCPUs

I was curious if anyone had any ideas about the tradeoffs for a LAMP server if I double the memory but lose 6 of 8 vCPUs? I can see that more memory could be good for PHP and mySQL intensive sites (I use WordPress on 8 virtualhosts).

I'm concerned that perhaps the 8 vCPUs are helping me more for PHP than extra memory, however.

Opinions? :-)