I want a new PC but Should I wait for Vista?

Thinking of buying a PC? You may want to make certain it's Vista ready. See the hardware guidance

https://www.microsoft.com/technet/windowsvista/evaluate/hardware/vistarpc.mspx 

Windows Vista Ready PCs and Customer Benefits
Windows Vista Ready PCs facilitate transition to Windows Vista by providing hardware requirements and guidelines to customers so they can make informed decisions on Windows Vista capable PC purchases and deployments before Windows Vista launches. Providing guidance on Windows Vista Ready PC hardware requirements reassures customers that their near-term PC investments will retain their value after Windows Vista is available.