New Studio setup

I am trying to set up a recording studio in the basement of my house.  We
have all the mixing equipment, but have been running it through a lame old
computer, and I want to upgrade it, but without breaking the bank.  The PCs
have dropped a lot in price, but it has been  a while since I have been
looking at sound interfaces for the PC itself, since my old PC couldn't
accept any newer hardware.  I would appreciate any suggestions you may have
for me, and whether you have any direct experience with them or not.
Thanks