How check what my internet connection speed is for my laptop?

[961]

Im trying to find out what my internet connection speed is so i can download steam. Here's an example of what its asking me:
Please select the correct internet connection speed for your computer.
Modem- 56k
DSL> 256k
DSL> 768k
DSL/Cable> 2m
Cable/Fiber> 10m

(ps we have comcast as our provider)

[WK of Angmar]

Go here: http://speedtest.net/

And do a speed test. Then choose the appropriate internet connection speed option.