Home Basic is the only version of Vista which has the least demanding umph compared to others. Home Premium comes next

There is no such thing as 2nd hand Vista or XP. As those XP/Vista copies have already been activated. Here are the versions of vista that I am using (All are OEM Editions and managed to get them at a cheaper price. It doesn't come in a fancy box. Just a manual and sticker along with the CD. I guess it must have dropped from Dell's factory )

Ultimate = Got money ? Then use this. However I managed to grab this version for RM ~RM 450 (bit cheap eh ?)

Business = Its actually Windows XP Professional with a new look and new stuff. Thats about it. It comes with encrypted file system and all those backup tools you need. However , it doesn't come with Windows Media Center and all those fancy tools that you get along with Windows Home Editions. Recommended if you are business user

Home Premium = I am using this for my HTPC. The main reason is because this is actually Windows XP Home Edition + Media Center addon. I wouldn't say this is Professional version of XP , as it lacks of Remote Desktop and other stuff. I just want this for Windows Vista's Media center so I can record Astro show , pause Live TV , listen to music and watch HD Content stuff on my TV. Its meant for home use

Home Basic = cheapo version of Windows Vista. Its actually Stripped down version of Windows XP Home. If you don't have much $$$$ , then its recommended to go for this version. Nothing fancy about it