I am in the market for a new Mac. My 2 year old Dell is a real piece and looking for a good upgrade. All of what I do is related to web surfing and programs related to my landscaping business. I do not use big design software, just basic Quickbook and a scheduling program. There is nothing that I have found that is comparable to my scheduling software made for Mac. Daylite comes close but it isn't there, so running one of the VM programs with Windows (XP will do me fine) is a must as far as I am concerned. My question goes to the build of the machine. I like speed, and an SSD has peaked my interest. My current machine only has a 120 gig hard drive, and I only have 25 gig on my machine. I keep music and stuff like that on a separate machine at the present time and may dump that machine too and just use an external wireless hard drive. How much space does Snow Leopard use? Parallels? Fusion? I assume my 25 gigs plus the apple OS should take up more the 50 gigs? Will a 128 SSD do it for me? I am still not sure between the 15 and 13, but I think that will mostly come down to how much money I decide to drop on this machine. One more thing, will 4 gigs of RAM do it?