to cable forum
As far as I am aware routers with combined ADSL modems do not have an ability to disable the modem so they will then work with cable.
You should just buy the wireless router for now and if you need to switch to ADSL at some future date, you could then just get an ADSL modem in place of the cable modem.
Linksys are a popular make, but quite a few seem to like Belkin and Netgear too.