If you have the opportunity, I would opt for the factory power prop. It is great for getting out of the hole quick and on plane quick even when loaded to the max. I find it especially helpful when wakesurfing...you pop up before you can blink.
To answer your other question, the 343 if perfect, even if loaded, for the 210. I thought about the 409, but for the size boat that it is, I really didn't see the need for the added HP and money.