Mangrove Monitor Lizards?

I have ben reading allot about Mangrove monitors because they seem to be kind of like water monitors i really want a water monitor but i already have allot of animals and do not have a whole room to give at the moment i am a very experienced reptile keeper and i have a breeding pair of timor monitors and i have helped raise my friends crocodile monitor so i am not new to large lizards but i would like to know if there are any other monitors that look like water monitors but only get 4ft-6ft? and a little about them (please do not suggest a bearded dragon or a Savannah monitor i really do not like ether of those) i would like something that i can carry around with me eventually.