to echo some of the curmudgeons here:
you've asked a question roughly equivilent to:
"I think I need a wheeled vehicle. It needs to travel 20-80 MPH. I have a bike, and I tried putting a chainsaw motor on it but it didn't work."
ok, you've done one of the important steps; determined your peak load. Now you'll need to figure out what your total watthour/amphour requirement is; I doubt that you run the laptop 24x7. So spring for a 'kill-o-watt' or equivalent and figure that out. average it over, say, a week. . . or better a month.
the second step is to determine your wind. this will probably require an anemometer (on a tower to get it up where your mill will live) and some sort of data logger (which can be made with a bicycle speedometer/computer and some creativity) or a week or more of real careful monitoring and documentation on your part. Depeding on the NWS or the local weather station will just frustrate you unless you're the local reporting station. steps 1 and 2 can occur concurrently.
the third step is to do a bunch of reading (buying Hugh's books from our hosts is probably a good step 3a.)
Step 4 is then to calculate what your mill should look like (blade profile and length is determined by windspeed, alternator cut-in and desired power output, but alternator cut-in is influenced by voltage, and you'll need to spend some thought on what the alternators' power curve will look like so you can compare it to the power available in your winds with your blade area.) People here will fall all over themselves to help you when you have lots of data to base calculations on.
As an example:
If your computer use is like mine (~100 watthours a day) and you can afford the batteries, one of Hugh's 4' machines on a 30' tower, set up for a moderate cut-in, moderate current, and a conservative furl, backed with a couple of good golf-cart batteries and your existing solar array, will handle the computer just fine. BUT: your milage may vary. Do the calculations and the measurements!
Alternatively, a properly sized set of blades on an ametek motor might cover your needs. . .(but you need to know what those needs are, and again with the wind information to define 'properly sized blades.'
Have fun;
Dan
