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I am replacing all the plumbing in my house and to the meter. I will be using PEX. I have manifolds for hot and cold with 3/4" inlets and 1/2" outlets at the valves. Do I need to use 1" PEX tubing from the meter and split to (2) 3/4 to the manifolds? I just want to eliminate pressure drops in the house as much as possible.

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1 inch will not do anything for you, unless it's coming from the street, and that's too much for a single family home. The cold manifold should have an opening at both of the far ends: one for the supply water and the other to supply the hot water manifold. –  Edwin Apr 6 '13 at 6:00
    
There are several auxiliary support products such as whole house water filters and water softeners which use 1" fittings and if you plan to use them, it would be convenient to have a 1" pipe from the meter. –  Philip Ngai Apr 6 '13 at 16:21
    
Even with a 3/4" meter, 1" pipe will reduce the pressure drop due to friction. How much is saved depends on the peak flow, it could be significant or inconsequential. The determining factor is not the manifold size, it is the actual simultaneous fixture demand. –  bcworkz Apr 6 '13 at 20:41

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