The Icom 605 is definitely a great radio- but will you use all the functionality it can offer?
2nd bit- looking forward, the E120 is legacy equipment that has marginal N2K abilities. You may want to consider upgrading the nav equipment.
NMEA 0183 is more that adequate for the AIS data.
[CA11] E120 Seatalk1 to NMEA 2000 conversion requirements