You will benefit from the larger pipe with a 3/4" meter. However, there will be pressure loss when the water travels through the tap on the main and when it travels through the meter.
We increase pipe size to reduce friction loss in order to maintain as much of our starting pressure as possible. We know that some pressure loss will occur, so we try to offset that loss with increased pipe size to maintain desired volume at the end of the line.
We have to take similar steps with the tap and meter size to offset the pressure loss through the tap and the water meter.
A 5/8" residential meter will have a pressure loss just through the meter of approx 11 psi. with a maximum flow rate of 10 gpm. This does not include friction loss from the tap or the meter setter.
A 3/4" residential meter will have a pressure loss through the meter of approx 11 psi with a maximum flow rate of 15 gpm.
A 1" residential meter will have a pressure loss through the meter of approx 11 psi with a maximum flow rate of 25 gpm.
A 1 1/2" residential meter will have a pressure loss through the meter of approx 11.4 psi with a maximum flow rate of 50 gpm.
A 2" residential meter will have a pressure loss through the meter of approx 12 psi with a maximum flow rate of 80 gpm.
Each size has approx. the same pressure loss but has different max flow rates. The 1 1/2"-2" meters will have less pressure loss at 25 gpm than the 1" at 25 gpm max flow.
If you are abe to use a commercial grade water meter, a 1 1/2" commercial grade water meter will have a pressure loss of approx 6.9 psi at 160 gpm.
There would be very little pressure drop at 30 to 40 gpm between the main and the 4" service line with the 1 1/2" commercial grade water meter and setter.
All of these charts and specifications are great information, but have very little regard for the "cost factor".
If your local water supplier will only tap 3/4" or 1", you could get by with the 1" tap and meter. In fact, unless you were going to need more than 25 gpm, I don't think I would pay for the 1 1/2" or 2" tap and meter if I thought I would need a booster pump with the larger taps. With the 4" service line you are at a calculated 51 psi. If you go with the commercial grade water meter, you still may experience an additional 1-3 psi drop in pressure. That would put your pressure at the house approx. 45-50 psi. Most people are not happy with this kind of pressure.
Be sure and check the pressure loss ratings of the meters used by your local water supplier. Have them verify the estimated flow rate out of the meter. This will be very critical in your meter size decision, unless they can only provide 3/4" or 1" meters. The specifications I used are from "Sensus" water meters.
If I were plumbing your house here in Missouri this is the way I would approach it. We have to put alot of faith in charts and specifications to guess at the end result. Long water services such as this one are always a challenge!
Bear