IC-M15e are great though tie a lanyard on it mine slipped off my belt whilst tying up in the marina
Luckally found a friendly bubbley who recovered it for me 3m for 30minutes and still works 6 years later.
IC-M1v also good, icom do a protective case like a mobile phone pouch, coastguard have them, if you want pt.no. email me.
Hint for both wash the salt off them - in the manual
Also put a dob of silcome grease under the knobs on the M15 and between the spindals on the M1v stops the salt build up sticking the two together.
On those two if you want to hook up to an external antenna its an SMA connector.