modem and wireless router

I am on Centurylink for my home internet service. I currently have to pay a $5 a month lease fee for the modem/router. My speed is 7mbps and i just uped it to 12 mbps. I asked them if i still have to rent the modem or if I can buy it now (my only option last year when i signed up was to rent it). They said i can now buy it for $100 and if I did they would send me out the latest and greatest modem.

The one i have now is a Actiontec Q1000 . It does everything we need it to do but i was trying to figure out if i can just buy one on my own or if i have to get one through century link. The $100 seemed excessive so i was hoping to get recommendations on a cheaper one that is comparable.

Let me know if you have any advice or if you need any other info from me. We have 1 computer in the house but a handful of devices that access the wireless (iphones, ps3, mediaplayer, etc...)

Thanks for the help.