The choices of light bars on eBay and Amazon is overwhelming.  What features should I be looking for?  How many watts?  Waterproof is a given.  How long?  Curved or straight?  What's a fair price?  What is junk I should avoid?   Next question is how to mount it?  I was thinking of mounting it to the OE luggage roof rail tracks it would be about 39".  I was also thinking a smaller one that mounts on a 1998 roof rail - about 36".  Or, I could mount a bracket to the OE roof rail tracks to