what is your primary use for dsl and how many machines will be connecting to it ?
i have 1mbit dsl running through a smoothwall machine/proxy and 5 machines around the house running through that all with the usb speedtouch modem, and my friend it rocks!
cant see the pci modem being any worse or better than usb and ethernet unless you have specific needs for a ethernet based router.
BTW i seen a router/dsl modem in SMC for around £200 thats all ive seen m8