All I want to use the ramps for are oil changes. I just bought Rhino ramps from Autozone for $29.99 and a 2x10x12 wooden board from Lowes. Cut 2 50" and the 2 22". The Nismo clears it fine but I am on stock height. I followed these directions:
DIY Low Profile Ramps - great for changing oil on lowered g's - G35Driver
Otherwise, if you have the money to spend on the nice race ramps, I would go to that route.