I wasn't really interested in Harley's either, remember I was riding a 98 VFR. I rented a Dyna Wide Glide when I went to Phoenix and I got home and couldn't ride the Honda anymore, seemed odd. Don't write off Harley before you spend a couple days in the saddle. I wish I had gotten one 15yrs ago.
Hmm.. where have you been seeing the Machs so inexpensive? The cheapest one I've seen is this one
http://adcache.collectorcartraderonl...4/82776824.htm
and its an 03 with 121k miles. Mine has 12,200 miles and is an 04, I really don't think I'd have it for long if I advertised it for $20k firm. I figured you'd have a strong grip on the price of one as its one of only 2 mustangs you'd consider. Where have you seen private sellers selling them?