I just finished installing my new Intel 520 series SSD, and I can offer you my opinion based on what I did. I recommend that you install Win 7 to the SSD, and not to the current HDD. Since you say that you will do a clean install, that is the best idea to start from scratch and have everything pristine. The Intel data migration software is really good and I had no problems with it. I was not able to do a clean install directly to the SSD because I had a Win 7 "upgrade".