These JST connectors are what commonly come with strips (at least the strips I buy)

Also if you want to get a little fancier with the wire, I've used this in areas where it'll be 'visible' to help it blend in with the wall and give it a more professional look. Any 3 conductor wire will work provided it's 18-20 gauge. Copper is best -- avoid "CCA" or copper clad aluminum.