Always pick up a Mac when it's free! Even if you don't end up modding it yourself, it's always good for parts for other mods and, if nothing else, you can always find someone who wants it again and save it from the landfill.
On another topic, I'm getting ready to start a major round of modding this weekend. I've got my second Quicksilver chassis stripped down to the bare metal and I'm test-fitting the larger radiator, as well as a new hard drive cage, and marking where I need to cut. I've come to a dilemma, though: since doing my original Quicksilver mod, a graphite Sawtooth G4 has also come into my possession. Personally, I have always liked the older G4 case better (and probably would have gone this route in the first place if I had the machine at the time I started this project) but I'm not sure if I should switch gears and build that as my primary rig or keep going the Quicksilver route. Since the bulk of the work has to be redone at this point anyways, I have pretty much a clean slate to start with. The Quicksilver is a little easier to mod for modern components, in my opinion, and the silver color does look better with my modern Apple aluminum keyboard/mouse/monitor, but I keep gravitating back towards the graphite.
So I figured, as you guys are the modding experts, I'd ask the forum what route you think I should go for the next build: a far improved and perfected Quicksilver Mk. II, or a Sawtooth that incorporates the improvements I was planning to make. And before someone says to do both... lol... well, that may happen someday, but right now I am focusing on getting one case as close to perfect as my primary system and trying to reduce the excess of random computers running around my house. Any thoughts are appreciated!