Low$ a/b/g PCI Ad-hoc vs Hi$ a/b/g AP??

Has anyone considered the option of using a relatively low cost($<80) triple
mode A/B/G wireless PCI card in ad-hoc mode for WiFi access? Comparing that
to the relatively expensive A/B/G WiFi access points(>$150)?

This would be in an environment where there are 6 or less(usually 2 or 3)
WiFi connections/users. The peer-peer WiFi usage would be minimal as most
traffic would go to the PCI card and be bridged to the ISA WAN NIC or end in
the box(server) the PCI card is in or less often be bridged to the main
wired LAN.

Can one configure ad-hoc mode in triple mode? Or for ad-hoc mode does one
have to choose A vs B/G? Will one of the triple mode PCI cards keep alive
both A and B/G connections simultaneously in ad-hoc mode? I notice that
A/B/G access points always have two antennas but the triple mode cards only
one antenna is one of the reasons I ask.

For a small number of WiFi users( 2-6 @ less than 50 feet) ad-hoc to a
server based PCI card seems attractive in just terms of dollars,
reliability, cabling clutter and power connections. Just a PCI card.....

Is there an low cost USB triple mode A/B/G WiFi adapter available?

What about just a B/G PCI card in ad-hoc mode vs a B/G access point?

Anyone?

Has anyone considered the option of using a relatively low cost($<80) triple
mode A/B/G wireless PCI card in ad-hoc mode for WiFi access? Comparing that
to the relatively expensive A/B/G WiFi access points(>$150)?

This would be in an environment where there are 6 or less(usually 2 or 3)
WiFi connections/users. The peer-peer WiFi usage would be minimal as most
traffic would go to the PCI card and be bridged to the ISA WAN NIC or end in
the box(server) the PCI card is in or less often be bridged to the main
wired LAN.

Can one configure ad-hoc mode in triple mode? Or for ad-hoc mode does one
have to choose A vs B/G? Will one of the triple mode PCI cards keep alive
both A and B/G connections simultaneously in ad-hoc mode? I notice that
A/B/G access points always have two antennas but the triple mode cards only
one antenna is one of the reasons I ask.

For a small number of WiFi users( 2-6 @ less than 50 feet) ad-hoc to a
server based PCI card seems attractive in just terms of dollars,
reliability, cabling clutter and power connections. Just a PCI card.....

Is there an low cost USB triple mode A/B/G WiFi adapter available?

What about just a B/G PCI card in ad-hoc mode vs a B/G access point?

Anyone?