I know what your asking but I can't pretend that HD's are priced similarly, because there not. I like some of the HD bikes (such as the new 09' V-Rod Muscle - Awesome!) but cost is always a factor one has to consider when purchasing one IMO.
IF Harleys' were priced more in line with the Metric competitors & offered more Liquid Cooled motors I would be a bigger fan.
IF You want the Classic American cruiser & you want to be apart of the HD family then do that.
The bikes are totally different. M90 is a modern, sleek looking muscle crusier, Liquid Cooled, Shaft Drive, Softtail Hidden Shock, 5-speed, Inverted Front Forks ($9,999.00)
The HD Fatbob has classic cruiser styling, Air Cooled, Dual Exposed Rear Shocks, Chain Drive, 6-speed (nice) ($14,999.00)
Whatever you do, don't let anyone pressure you into buying either bike. Ride your ride brotha!