Quick measure of site response speed

I'm looking for a way to measure site response times for a matrix of 
competitors. I can measure their page size easily enough and learn 
that with a 56 K modem, the page will take a certain time to load. 
But what I can't determine is the site response. I used a couple of 
fee-based services (e.g. Keynote) to measure my site and it is 
lightning-quick. But using those services to measure 12 competitors 
would be very costly.

All I want is a one-time measure of a single page http response, 
overlooking page size and line speed. Anyone know of a service that 
offers this?

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