You ought to take a look at MSI's K7N2G-L, it's got onboard sound,
video, lan, and a tv-out. I dont think it comes with a modem, but i'm
sure you can pick up a 56k somewhere for 20$. It's also a stylish shade
of red, if youre at all interested in color
The soltek 75MRN-L has the same features, minus the tv-out. Both boards
are nforce2 and hover around the 140$ mark. Their onboard video is the
best at the moment, and it allows quite a bit of upgradeability.
MSI's a bit more expensive but has the tv-out, the soltek is less
expensive, but doesn't have tv-out.
I haven't done research on boards with onboard modems, mainly because
I've got cable. Either way, I've seen some selling for as low as 10$.
Another way to go would be to buy some old video card, like a TNT2 or
g400 or whatever you can pick up for 20$, and get a board like the
soltek 75frn-l which doesn't have onboard video. It still has the sound
and lan, and future upgradeability as an option. You could save maybe
30-40$ that way.
I'm a big fan of the nforce2 boards, theyre coming out with the next
generation of that chipset right now so prices ought to be going even
lower. It's been getting great reviews, hope this helps your research.