I have the same little ticking dependent on speed on the passenger side. I took it to Mr Tire (yes, I know, but I like this one particular mechanic there) and he changed out the driver side CV joint, saying it was badly worn (I looked at the unit he pulled out, and it was), but the ticking remains. I'm just living with it. I suspect the passenger side may be wearing out. My 98 has 350K miles on the clock, so I'm pretty sanguine about it. I hope you do definitively determine what the noise is.
I really only notice it when I have the passenger window open and I am driving past a jersey barrier or a surface that sound bounces off of.