logging systems/software

i'll take advantage of the relative quiet to ask quick (and hopefully non-controversial) question... does anyone have any particular favorites for reasonable cost logging/tracking systems for trouble reports, outage reports, customer service problems, and complaints (such as might be received about spam at an abuse address)? we need to select something here soon, as we're going to actually be in business shortly. thanks, richard (soon to be welty@inet-solutions.net)