MSFN is made available via donations, subscriptions and advertising revenue. The use of ad-blocking software hurts the site. Please disable ad-blocking software or set an exception for MSFN. Alternatively, register and become a site sponsor/subscriber and ads will be disabled automatically.
My $0.02 worth. For the same hardware, WinXP would take up more resources for mostly cosmetic reasons (alpha transparency, menu shadows, etc.) So if you have the extra cpu cycles to spare, WinXP is an interesting experience. If you experiement a lot with new software/ utilities/ shareware, you will welcome WinXP's System Restore feature. However, that calls for a conscious and well-disciplined testing mentality. Win2K is the last version of Microsoft product that does not require product activation, and has decent to excellent hardware drivers available. So if you are experimenting with many different hardware or planning to upgrade hardware very often, Win2K is the best version to keep.