A nice chart with a lot of springs listed. You can take a look at what's in the FPS range of what you want.
ASC Spring Chart
http://www.airsoftcanada.com/SpringChart.php
"Modify" Brand Spring Chart
http://www.airsoftparts.ca/news/modifyspringtest.pdf
Note that the modify spring chart does not list the S90 spring, however the S90 typically fires about 330FPS.
Be advised all numbers are variables and can be affected depending if you have done any previous modifications to your rifle.