04-05 450r spindles are the best bet in my eyes, for geometry and being able to find them cheap
A tip that might help you with the ball joint/camber issue:
Take the nut off of the lower balljoint (the one on the outside of the arms closest to the tire) run the balljoint all the way in and just use the nut on the inside of the a-arm (side closest to the frame)
This will pull the spindle closer to the a-arm on the bottom and give you a lot more adjustability out of the top balljoint
Also the closer the ball joint is the a-arm (more threads penetrating the arm) the stronger it is