On the first, also remember to check out the power supply as caps on one can effect the caps on the other.
as to the second, I know what you mean, I personally stopped buying any computer gear that did not advertise a better build quality. Partly due to the ever present race to the bottom in part quality and partly as I live in a hot area / long way from the power stations (bad mains supply power). A computer can run soo much better when ruggedized with only a few better caps / design.
Yes, especially cheaper caps (of the cylinder design). Solid caps do not matter any where near as much but then they are not as good for large power loads (cost wise).