Depends on if you're buying the `ukulele for the `ukulele, or for the pickup.
If its the 2nd, the stop reading.
The `ukulele should always come first. Then, if the pickup is important, have it installed. OR, have the factory/builder install it for you upon purchase/build. Unlike guitars, most good `ukulele don't have pickups preinstalled.
You have to read through the most - I'm seeing more high end instruments with pickups being requested they be installed. I'd say the last 10 out of 10 instruments I've done have had pickups. For MGM, he's batting a thou.
-Aaron