Hey, this is a suggestion based on what I had to do.
Being I live in an apartment by myself I only have 1 TV in the living room.
But my PC is in my bedroom, much like yourself I faced the dilema of how to
test changes made to the box after FTP with out going back and forth.
Answer to this was my DV mini cam.
It has a 2+ inch LCD that I use as a monitor.
I plug the S-video out of the XboX into the S-Video in on the cam corder
and keep it on pause, so to display the image on the LCD.
Its small but it works well enough.
This is modding, there is no guide echetd in stone,
some of this stuff you have to figure out for yourself,
or at least research. Asking Folks to send you software made
from copywritten M$ Code (illegal) is probably not going to go
over well with the moderators of forums like this or the
"enthusious" crowd that enjoy the hobby of modding,
hardware-hacking and software-engineering, who feel that
in order to keep it alive we must keep it underground.
My $0.02