I use this one from Monster Tower on my 2004 SSV:
I've had it on for a few years now and it is rock solid. It doesn't budge at all when crossing over double ups, etc. At $110 (bracket only) it's hard to beat. Prior to this I had used one of the DIY-Wake brackets off of e-bay. That one didn't work out so well as it would move no matter how tight I had it. It also tarnished over time. The bracket from Monster Tower still looks great after 3 + years.