Honestly, any of those machines will get the job done. Based on the tasks you are performing, I don't think you are going to gain much from any of these as far as future proofing. However, You don't need any dedicated graphics to do word processing/internet. So an Integrated Graphics system would save you some money. I don't think the Pugetsystems you chose is quite what you want, you are paying a lot extra for things you don't need. For best future proofing, you just want a fast processor and a lot of RAM. (RAM is cheap these days). You definitely don't need raid, but keep up your backups as you have been doing. The HP on top has the best processor of the bunch (without overpaying), but that computer is running Windows 8. Personally I...