I got engaged about a month ago myself and believe it or not, as we were looking through some bridal/wedding magazines (yes, this is the future you can look forward to while planning a wedding), the iPod was listed as a recommended gift for the groom. I wasn't aware of this, but I guess it's custom for the bride and groom to exchange gifts at the wedding (I'm so clueless), and the iPod is apparently a perfect one. Don't know if this helps you much for the engagement, though.
If you need any advice about ring shopping, e-mail or PM me. I did a ton of research and I am proud to say that my fiancee not only loves her ring, but that it also appraised for double what I paid for it!