Here are a few ukulele string sets to try out first:

• Ko`olau Guitar & Ukulele Company - Ko`olau 'Ukulele Strings
• Aquila - Nylgut 'Ukulele Strings
• Worth Strings by Worth Creations - A wide range of tensions

I bounce between the Ko`olau Strings and Savarez Alliance (Red Card-R) on my tenor ukuleles.

The Ko'olau strings are shaping up to be pretty good on my ukulele.

Ko'olau `Alohi strings are available right here on my site.