What sprayer to use?

[MudDuck 20]

I'm going to bite the bullet and get a sprayer for deck staining. What would be your recommendation. I'm looking at some of the Apex airless sprayers at Lowe's for a starter. (should I upgrade the gun on it?) Are there any reason "not" to use one of these? I know about the Deckster but I don't necessarily want to spend that much at this point but is it really functionally any better and why. RS and Oly max is what I would be spraying normally. I really know nothing about sprayers so any advice is greatly appreciated.

[weaselcossey 14]

My local Sherwin Williams is having a sale through late august. They got the Titan 440i for $699, with hose, gun, and 4 tips. Might be worth looking into. Wouldn't you be kicking yourself this time next year if you had to replace the $300 sprayer from Lowe's?