In my area we have a few companies who specialize in restoring water pressure by using a special machine that sucks the rust build-up out of the pipes. They use it at the faucet and it often works pretty well. Only downside is that the rust eventually builds back up, so it has to be done ever couple of years or so. The company I deal with is called 'Pressure Pro' and they charge about $100 per faucet.
Another issue could be a long horizontal run of old galvanized pipe, such as in the basement coming from the main valve. If that is rusted it should be replaced. I've often seen when the pipes "look" perfectly fine, but when taken apart you could barely see through them because of the rust blockage.
Just some thoughts.
[COLOR="DarkRed"][B]~ ToolGuy ~[/B][/COLOR]
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