Instead of using `Windows' fonts here, why don't you try KDE and GNOME
fonts(the defaults)? I've never heard anyone complain about fonts in KDE
and GNOME. So, try the defaults once. I bet you'll like them. And no,
migrating to GNU/Linux doesn't mean you lose the clarity, in fact,
migrating means you get the best of everything...stuff micro$oft can't
host for another 10 years and above all, it's free(as in free speech,
not free beer).
There is one theme for KDE called "KDE-XP" which mimicks XP. Hope it helps.