First off, I just KNOW I'm going to ruffle a few feathers posting this... especially of those who earn some of their living designing "sales page" or "squeeze page" themes for Wordpress.
I just feel this needs to be said.
I absolutely love Wordpress... as a blogging platform.
But as a platform for sales pages and squeeze pages, IT SUCKS.
Some of the reasons people love it are for the editor. Yes, you can easily type up the content. That's great.
But then, you can also do that in a HTML editor like Kompozer, so there's no real advantage there.
As long as you've already got the underlying HTML done for you (like a "theme" in Wordpress, you can use a free HTML editor like Kompozer and almost never have to fiddle with the underlying HTML.
Now, let's get to the major drawbacks of Wordpress.
As you may know, I'm a bit of a split testing fanatic. If you're not split testing your squeeze page... trying out different headlines, body copy and offers, you're throwing away subscribers and money.
Have you tried split testing on Wordpress? It's a NIGHTMARE.
However, with the right split testing tools, split testing on an ordinary HTML or PHP squeeze page is a doddle.
Third, you can get lots of squeeze page or sales page "themes" for Wordpress, but if you want to try changing the design just a little bit... well, good luck.
You basically have to know the inner workings of Wordpress.
To change a HTML squeeze page, you just need to know a little HTML.
So while Wordpress is a great blogging platform, I think it SUCKS for squeeze pages and sales pages.
If you REALLY like a Wordpress theme, why not ask the designer to create a HTML version?
Then grab yourself a free HTML editor like Kompozer.
That way, you can get the same look and feel as the Wordpress version... but with the addition of being able to easily make small design changes without getting yourself greasy under the bonnet of Wordpress, and split test easily with the right split testing tool.
Just my opinion, of course... but I think in the end you'll save yourself a lot of time and effort... and when you want to split test you won't have Wordpress to contend with