First off, I would be more wary of what your internet provider will think. Its pretty much a universal rule that hosting web sites off of personal connections--regardless of traffic--will violate your ToS and end up with you receiving a warning, or getting your service canceled.
As for your answer, you're not going to have any issues hardware wise. You can host far more on far less.
EDIT: Your ISP may allow it, but I'm just warning you--I wouldn't want you to have your service canceled because you violated your respective ToS/AUP. For example, Comcast and Time Warner both prevent you from doing so, and a good portion of ISPs block port 80 on ingress (but not other ports).
-use or run dedicated, stand-alone
equipment or servers from the Premises
that provide network content or any
other services to anyone outside of
your Premises local area network
(“Premises LAN”), also commonly
referred to as public services or
servers. Examples of prohibited
equipment and servers include, but are
not limited to, e-mail, Web hosting,
file sharing, and proxy services and
Time Warner ToS (they will require that you upgrade to business class if they "catch you" hosting a web server):
Unless you have specifically
subscribed for commercial grade
service, the ISP Service is provided
to you for personal, non-commercial
use only. The service cannot be used
for any enterprise purpose whatsoever
whether or not the enterprise is
directed toward making a profit. If it
is your intention to use this service
for these purposes, please contact
Operator to inquire whether commercial
grade service programs are available.