I wouldn't use the Emi Delta pro 8a, it's more of a mid speaker to me (high Fs low Qes).
I have good experience with the Alpha 8a, not an xmax monster but nice sound up to the point where it starts to fart out.
Is the LA-8 closed?
If so then the Faital is a good option, or the Alpha 8A.
The Beyma 8G40 can take some abuse for an 8" driver.
But since the LA-8 just puts out 30watts I would go for the Alpha 8a, gives you most bang for the buck
For 10 bucks more you have the Faital, but i think both will perform approx the same though the Faital may have a slightly larger mechanical xmax.