Sensitivity and proper t/s parameters for the desired box (the parameters that define the driver carachteristics) are fare more important in driver choice. 

Furthermore the difference between 800 watt and 500 watt Is about 2 db, theoretically, even less in practice , so barely perceptibile, and usually drivers with more  wattage are less sensitive so Need more Power to  reach the same level.

I know the market wants you to think in Watts, but It is not so useful.

I use 15nd930 , 1kW amp power per driver , and never had problems in 4 years.

Anyway listen to mobiele eenheid, he knows a thing or two about cubos...

A few things you have to understand (if you don't already), without going much in the details :

2- max spl does not only depends on wattage. Lookup for driver sensitivity. 

sensitivity is a figure which tells you how much SPL you will get for X watts. So 2 drivers with different sensitivities will yield different SPLs if you feed them with the same power.

3- other things come in play, like power compression : once a driver is hot, more power is disspated in heat, e.g for a 1000 watt driver, fedding it 1000W over 800W won't give much more SPL if any (but instead will heat up the driver more, which can lead to issues)

I'm over-simplifing here and there, but just understand that more watts does not always means more sound pressure. (our kicks are BBC215, there are 2 recommended drivers, one with more max power, one with more sensitivity, the most powerfull has actually less max SPL due to lower efficiency)

Sorry, can't comment on the cubos though, but in your shoes I'll stick with the recommended drivers

You are really very modest and funny with it. 

I'm pretty sure you'll be able to help the op find a suitable driver.

Why? 

What is special about them being 800 to 1000 watts? 

What if they're able to take lots of power but sound bad?

What if they take lots of power but are really inefficient so put out less spl? 

Your request makes little sense. Might be better if you explain why you asked this and what you are trying to achieve.

to make sense. i just want to load my cubos with a driver that gives the heaviest en best sounding kick.

If you say, I'm just gonna use one kick per side, EQ a bit as I'm mostly interested in a low thud, I would choose the 15LW2400. If you say, I like a bit more snappy kick, or I'm going to stack the kicks and/or use multiples per side, I would choose the 15NLW9300.

Ahh.. so much symbolism, where to begin?

I could tell you that mobiele eenheid means "mobile unit", if that mobile unit is you, a person (are you really?),  therefore having legs would be the basis of said mobility in 95% of cases?

Does this story have legs? Am I about to have a leg up or am I just talking the hind legs of a donkey? Basically I'm trying to give people a leg up and not to have the legs of someone because I don't have a leg to stand on. Truly I'm not trying to pull your leg nor would I want you to leave with your tail between your legs, basically I'm just showing a leg. Because to have the bass and kick covered means to have pulled the weight of someone's legs, giving that person the first leg of ones journey. I mean, you have to get sea legs eventually.

Although it's probably just a Dutch saying not translating very well to English.

Best regards Legs

Hey Jo, 

just curious which other drivers you use in combination with the Cubo15 / 15ND930? I'm planning a 12v sound system based on a Cubo with the same driver (which would be covering approximately the 40-100hz range), but don't really know which other drivers would compliment the 15ND930.. I was looking at 2x 8NMB420 8" drivers, plus 3-4x HD1050 1" drivers (plus horns) from Eighteensound. Do you reckon those would compliment each other nicely?

Thanks!