Let me start by stating that I think MC GPS units are over priced. I have used my Nuvi on my bike and I have used a GPS app on my smart phone on the bike but neither is a perfect compromise. I would also like to start making custom routes which means I would need something I can download from a program such as Base Camp. I found that the GPS Store has the Zumo 660LM on sale for $499 and can get free shipping. The price still seems steep but starting to look more realistic. Knowing the 66x series is the older unit in the Garmin Zumo line, would you buy one for this price if you were in the market for a new GPS? Would you wait to see if the price comes down more? Or would you spend more money for one of the newer 390 or 590 series Zumos and why? Keep in mind I would BT everything to my helmet via a Sena SMH10. All advice is appreciated and welcome all opinions.