Entending a Wireless LAN - Access Point, Bridge or Router?

I have a workgroup LAN setup at my home consisting of a cable modem and
Linksys WRT54G router. Multiple PC clients with B or G capability throughout
the home currently connect to this router wirelessly. Now I want to extend
the *wireless* connectivity for people that I will assist in my home with PC
configurations.

I built a workshop/lab in the basement and I want to have a way to connect
up to five multiple PC's at a time with the *only* requirement is that they
have an Ethernet port built-in. They will not need a wireless card nor will
I need to install one. I want these PC's to connect to a hub or switch that
will *wirelessly* communicate with my LAN. I do not want to run e-net cable.

Would I want to connect a WAP11 or WAP54G wireless access point linked up
with a EFAH05W v.2 hub? If yes, would a EZXS55W switch be a better choice
than the hub?

In an alternate but related situation, I was considering replacing my
individual cable modem and WRT54G router with an all-in-one WCG200 Cable
Gateway, since the cable modem is intermittently malfunctioning. If I do
this and make the cable/gateway the primary point of traffic in/out of the
LAN, would it be more sensible and feasible to connect the WRT54G router
(which would act as an access point and switch) to wirelessly communicate
from the basement workshop/lab to the primary LAN cable gateway? This would
at least give me four hard-wired ports at the WRT54G switch to connect the
workshop PC's, and that would then communicate wirelessly with the LAN. I
would also not need to ditch the WRT54G.