[Hampshire] ADSL Modem

I am currently on zen internets Home 500 system. I am thinking of
upgrading to their 8Mb service for the same price. However, I am not
sure my old Netgear DM602 is up to the task.

Can anybody provide me with what I need to look for to make sure
that a ADSL Modem is compatible with these new high speed services.

Thanks in advance.
--
Philip Stubbs