Jann,
Are you familiar with
Conversation Gambits, by Eric Keller and Sylvia T. Warner? It's published by LTP, and the edition I have is dated 1988, but there may be a more recent one.
Some gambits that may interest you are:
In a case like this...
In this sort of situation...
The point is...
But the real question is...
But can't you see...
To start with...
Another thing...
Perhaps I should mention...
Oh, I almost forgot...
What's more...
Not to mention the fact that...
Plus...
Plus the fact that...
Not only that, but...
The reason is...
That's the reason why...
Let me put it another way.
What I mean is...
Don't misunderstand me, ...
I'm afraid that just isn't true.
The fact of the matter is...
Some people say...
But in fact...
You've probably heard that...
Many people think...
The fact of the matter is...
But actually...
Yes, but...
That would be great, except...
Even so, ...
Possibly, but...
Look at it this way.
Well, you get the idea. Maybe these will be helpful to you. And check out the resource. Oh, and by the way, grammar's included in the above gambits.

Package deal! Good luck.
Larry Latham