well here are the best deals you will find for US.
www.deals2buy.com
networking is the best asset of win xp but for a common man using 1 computer xp home works good.
I bought the xp professional at a student discount but I am still maintaining that xp home is better.
btw why buy xp home or professional now????????????????
Windows vista, windows media center, xp proffesional 64 are all out and they trample the older OS easily.