One of the most important choices you'll have to make in picking out a new ukulele is the decision between acoustic and acoustic-electric. Both types' sound great when you play them as-is, but acoustic-electric models give you the added ability to plug into an amplifier or mixer. You'll also want to think about the tonewoods in the ukulele body: Koa is the classic, but other materials, such as acacia, are great to get a different look or sound.
If you want something really unique, check out the Kala U-BASS lineup. These are the size of a typical ukulele, but their special strings produce serious bass tones. When you've got them plugged into a great bass amp, you'd be hard-pressed to tell them apart from a bass guitar by sound alone. That makes them perfect choices for uke players interested in the bass, or for bassists who want something light and portable to travel with.
On that note, Kala offers a good selection of travel ukuleles. These usually have a shallower body to take up less space when you pack, as well as including a case to protect the instrument. Available in "pocket," concert, soprano and tenor models, Kala travel ukuleles are perfect for a musician who likes to hit the road.
With so many instruments to choose from, there's sure to be a Kala ukulele just right for you. It doesn't matter what stage you're at in your music career: as long as you want a fun instrument that's easy to learn but rewarding to master, a ukulele from Kala will definitely satisfy.