Run your spoke calculations and use Wheelsmith or DT butted 2.0 / 1.8 spokes and call it a day... if you want to save a little and don't mind a little more weight straight gauge 2mm stainless DT / Wheelsmith will also build up a nice wheel that will be a touch stiffer and a little more bombproof.

Using straight gauge spokes will save you about $18.00 and come with nipples while you will also pay a premium for alloy nipples.

On nipples...

Use brass nipples... they are stronger and less likely to round out or corrode and if you have to use alloy nipples make sure you use spoke prep to prevent seizing.

Brass will also make the first build easier as they will forgive you more.