755 is pretty good. it is also your middle score, which is what most lending institutions look at. You should qualify for a decent rate. Shop around with different lenders to make sure you get the best rate you qualify for.
It's good. 800+ would be excellent
This article suggests that 740-850 rates as excellent, their interesting chart shows the potential loan interest rates for different credit ratings.
http://credit.org/blog/what-is-a-good-cr...
decent, excellent is above 800