Best strategy

Keep the familiar XP skin, use 64bit for maximum memory (Mac server can use 64gb???),
for the present-just use 4Gb memory, buy the fastest processor (less expensive!!!) and await a truly new OS from Microsoft or Linux!
Xp's memory use was crippled despite MAEafter SP2 "due to poor drivers": any new system should wait until good drivers are written for existing devices.

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