If the PC is working and stable, tweak it. At the moment I am playing with LVM – logical volumes. That way I can resize my partitions the way I need them on the fly. If you want to do something advanced, move the root partition on a lvm volume. It works, if you do it right.

A hint: look at /etc/lvm/lvm.conf twice. Typos in there can keep you busy for a longer time.