When I first bought my 2004 Aveo it had 97000 Km on it and I got the timing belt done right away. I didn't bother doing it myself since the shop I took it to charged me $170 including the timing belt. I'll do the water pump when I do my next timing belt change. After that I did an oil change which I do every 5000 Km. I also changed the spark plugs, spark plug wires and serpentine belt.. The valve cover gasket was leaking at the back so I changed that also, and I had the coolant system flushed.
In the OEM manual it recomends that you flush your brake fluid every 2 years but I had mine done when my back wheel ceased on me. But from now on I'll probably do it as preventative maintenance.
Right now I'm waiting to get my metal thermostat housing. Hopefully it will get here this week and I'll do it next weekend.