Hi Joseph, > Which OS gives the 2400 the best speed & performance? (ie when does > the OS upgrade factor begin showing the limits of even a fully > upgraded machine or what OS upgrades result in the need for Houdini > style tactics to load on a 2400 etc.) > > The 2400 I recently purchased has 8.1 loaded on it. OS 8.1 isn't bad for the 2400, but the selection of browsers is very thin. The 2400 will be *VERY* nimble with 8.1, but I'd say which OS you use depends largely on which apps you intend to use most. Overall, OS 8.6 is the most feature-rich for "RAM-challenged" Macs although 9.1 is also a good choice if you know how to trim it down.... Gene Osburn Common sense...isn't