What size linode 40,000 page views per day?

If the pages are truly cached, and therefore effectively static, I think a Linode could pump out an awful lot of page views. My guess is (and I really don't have any numbers, maybe somebody else will be more scientific) that any Linode will do it. Estimate how many concurrent viewers you'll have, figure out your memory usage per Web process, and pick a Linode with that amount of RAM or greater.

The pages are cached for 60 minutes.

The problem is its a wordpress install with quite a few plugins in there look at what it takes to generate the homepage:

461 queries. 6.646 seconds.

Even with caching once this site gets bigger its the queries that are killing it.

I'm in the process of getting the plugin code into the includes so plugins don't require database requests.

I'm definitely bringing it over to linode this month to give it a shot but want to get some more optimization in place and get everything working on a centOS server at my office first.

Any further suggestions for optimization?

@Hona:

The pages are cached for 60 minutes.

The problem is its a wordpress install with quite a few plugins in there look at what it takes to generate the homepage:

461 queries. 6.646 seconds.

Even with caching once this site gets bigger its the queries that are killing it.

I'm in the process of getting the plugin code into the includes so plugins don't require database requests.

I'm definitely bringing it over to linode this month to give it a shot but want to get some more optimization in place and get everything working on a centOS server at my office first.

Any further suggestions for optimization?

Wow, if it takes 461 queries to pull up one page, you have one seriously overloaded WP install. Lose some of the plugins or start optimizing.