I would most assuredly spent the $150 on Windows XP Pro OEM (full version), than to buy XP Home. As long as you have a real certificate of authority and the disk is a nice shiney hologram these days you are good to go..
I really believe that XP is really worth the price and the people working on it deserve the money and time for their work. I hope the Amiga community believes in paying for their products (even as much as the PC community does). I know people who used to spend $70 for a really terrible Amiga word processor just to support the community. I hope that same thought pattern is still there..
