I'm planning to buy a mac pro to replace my 4-year-old Dual G5. I hope to use the new machine for at least that long, so I'd like a configuration that will give me a reasonable performance for the next few years.. My planned configuration so far is: 8-core 2.8 (or 3.0?) 8GB of memory (I have 3.5 now, which is a bit low) GeForce 8800 GT I'm not sure about the hard drive configuration. I'm thinking about going with the lower processor speed, but investing a bit in HD performance. Is the performance of the SAS drives worth the price (rather expensive HD plus the RAID controller)? Is it possible to have 1 or two SAS drives (for the system and frequently used data) and some large SATA drives (for the bulk data) in one system? Currently I use my machine for Aperture, digitizing and OCRing documents, Java development and running stuff like tiles@home (rendering map tiles for the openstreetmap.org project).