Kevin,
I bought a cheap (but great featured) in car camera from Jaycar last weekend. HD (720) resolution. It was $49.
It comes with windscreen suction cup mount, helmet mount and bike handle bar mount, sound, power cord, waterproof case etc.
The interesting feature is the camera is supplied with a clip on holding device. The suction cup mount screws into the clip on rather than the camera itself. This can be fitted so that mounting bracket "screw-in" is at top or bottom of the camera (rather than the "screw-in" being at the base of the camera as per GoPro). As a result the camera mounting bracket can be mounted on the inside of windscreen with the angle bracket pointing down.
You may be able to fabricate something similar (that clips around the camera) for your GoPro so that it can be attached to windscreen and closer to the action rather than at rear of cabin.
if this doesn't make sense let me know and I'll send you some photos.
cheers
Steve

I used the rear window and it was quite a nice angle as you can see yourself driving and see through the front window. I also have the suction cup and it will fit on the windscreen of a Spyder. I also mounted mine on the rear engine cover on the RHS with the top down in a clip on youtube, look under "MR2 up Camp Mountain" or Mister2 not sure, anyhow enjoy

I like to stowage box solution. 
 
I found the 180* setup fantastic both in the car and on my mountain bike and generally find it more stable mounted upsidedown.   I have also recently discovered the tether mount giving me the confidence to try some outboard positions.

Some more options