My car has 130k on it and at 60 or 65 it is fine, but when i push it up to 70-80, the steering wheel starts shaking unnormally, wonderin' if it is a bad ball joint or something. any ideas.

Same thing here...
 

I have 95K on my '93 SE, I had the tires balanced, no fix. I think I might have a slightly bent rim? What else could cause it? Maybe my brake rotor?

Both of you->
 

switch the front rims/tires to the back and see if it still vibrates. If not, you can eliminate the suspension. Bend rim, unbalanced wheel or old worn out tires.

I'll get to it soon
 

Been busy ordering and replacing parts on this car because it is new to me. Just put in new struts up front and I have new rear strut inserts sitting in the trunk. they are Gabreil VST's which so far handle really nice with the rest of the suspension stock. So when I replace the rear struts I'll swap rims and get an alignment. Also one of my rear lower control arms is bent so I'll replace that too, a new one was only $50 from http://www.nissanautoparts.com

Re: Both of you->
 

yeah thats what i did for mine....it was an unbalanced wheel....it only shook from 65-75....from 75-120 it was fine :D