let's not and say we did

final say

The right to make a final decision.

have a say

To (receive the opportunity to) voice one's opinion.

I'd say

It is my estimate or opinion.

I'll say

Used to indicate emphatic agreement

let's be having you

Expression to encourage someone to hurry up and move somewhere.

let's get the party started

Let's go; let's get this done; let's start more intense action.

let's get this circus on the road

Let's start; let's begin (a journey, undertaking, etc.).

needless to say

Clearly, obviously.