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Hi Boem,
I forgot to say - welcome to the forum - sorry!
If the problem is speed related - rather than engine rev related - or in which ever gear related (if you see what I mean) then my #1 suspect would be the propshaft.
If someone has taken the two halves apart without marking where the splines should match then you are in a bit of trouble. The same goes for if someone has removed one half of the propshaft and replaced it with another without balancing...
From my reading of the factory service manual (FSM) on the balancing of engine parts they only seem to prescribe static balancing - not dynamic balancing (like your tyres). This is quite straight forward if you can find a way of letting the propshaft rotate freely (so mounted on low resistance bearings or between lathe centres - long lathe!) and refitting the join in the propshaft so that the shaft will spin freely and not favour a particular (heavier) position. For dynamic balancing you need a balancing machine / transducers and a measuring system (say a FFT analyser). For a propshaft I guess the dynamic balancing option would be best.
Even so I think you need to see if it is a propshaft problem first - before you head off trying to find someone who can balance it.
If you are brave enough to drive the car - fix / tape a video camera or cheap digital camera (that will make movies) to the underside of the car and record the movement of the propshaft.
What ever you do look for a cheap fix first - don't get too worried about expensive fixes just yet!
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