I have been using a service. I search around and found that the other manufacturing services just give you cross referance parts. It cost me a lot in time and effort because the parts they cross referanced for me just turned out to be simular. We finaly had to hire a component engineer who left after a week being with us so I finaly got on it and searched for a service. The only one that did what I needed was http://www.atotalgps.com . Those guys are great. I sort of bugged them because I was constantly calling them but they did not mind at all i do not think. What I got were my parts croosed over exactly and some help on my solder profiling and rework questions.
So if your stuck I would go with them they are pretty good. The name of the place is called "A Total Green Planet Solution".
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