I have operated a small one man IT company for the last several years. Most of my clients are small businesses (Lawyers, Chiropracters, non-profits). Right now I have several client offices that are upgrading up from Pentium 4 systems, and a few others that want to add basic desktop systems to their offices to act as counterparts to their mobile computers that they use primarily. These offices generally are interested in low cost systems that can adequately and relatively speedily handle their basic operations (web browsing, word processing, email, database and CRM access, etc...). Anyways I have generally not kept a large number of systems in stock before, usually reselling systems that clients trade-in to other clients, or just helping an office choose a good system off of newegg or geeks. Since I have had so many requests for systems lately though I have decided to start actively buying systems. I have over a decade of experience refurbishing systems so I decided to shop around for used systems to fix up but I have been having a hard time deciding on a processor line/generation/brand to focus on. I'm considering the Intel Core 2 Duo, or a Turion, or Athlon dual core. Pentium D dual cores are very cheap but I know they are much slower than the core 2 duos. From their benchmark scores though it seems like a 3.6 GHZ pentium d might be better than a 1.6 Ghz core 2 duo. Any tips or suggestions would be appreciated in this regard. My goal is to keep these systems under $250 to sell, and I don't need anything cutting edge.