Welcome to the forums! I suggest you guys buy from DDM Tuning. Their HID kits come with lifetime warranty and in my opinion are the best bang for your buck. The only issue I've seen some people have with these are that the wires were switched around, so +/- were actually -/+, not really a big deal just plug them in opposite order. You can find out more info if you search for their products around the forums. Lastly, if you guys haven't checked it out yet, there's a whole section about lighting, exterior, etc in the Altima forums.
http://forums.altimas.org/zeroforum?id=253