I was in the market for a satellite communication device myself, and just picked up a Zoleo this week.  It was/is on sale for a good price($150) and seems less expensive overall than the Garmin subscription plans.  It does not have a screen, but pairs with a phone via Bluetooth, which makes messaging fairly painless.   Also, I already have a GPSMAP 62s and my Lowrance fish finder has mapping as well, so I was just missing the satellite communication piece to appease the wife.