Best modem for Comcast???

[EarpWJ]

I am switching to cable Internet and need a cable modem. I am getting a 20mbps plan and would like it if the modem is capable of going faster, as I dont want to have to buy a new one when/if I upgrade.

How much can you really go by comcast's own ratings?

 

[Emerald]

http://www.newegg.com/Product/Product.aspx?Item=N82E16825122009&cm_re=motorola_cable_modem-_-25-122-009-_-Product