I'm not vouching for that website... I personally wouldnt order from there - partly because i know of other vendors which i trust and havent let me down and partly because as said earlier it's trying just a bit too hard, just doesnt look right somehow. Anyway, you only get a couple of CE4s chucked in with the kit and they are selling them for £3.50 each, so if you got one from Vape Escape @ £45 and used a discount code to get an extra 10% off that would actually be a better deal from a good vendor.
I havent actually owned a VAMO before, so couldnt tell you if a manual is included, but they generally are. It isnt necessary to have coils with different resistances to use different voltages either - you can set the voltage or the wattage to a level you enjoy. Start low voltage/wattage and work your way up until you find what works for you. The lower the resistance of the coil, then the less volts you need to achieve the wattage you like. Let's say you enjoy vaping at 8W - on a 1.5ohm coil that would be around 3.45 Volts, but on a 2.4ohm coil you would need around 4.4 Volts to achieve the same. I would guess that with the VAMO you set it to the wattage you prefer, then it adapts whatever coil the atomiser you are using has (I may be wrong about this, so get confirmation from a VAMO owner). Remember too that different juices taste better at different wattages, so you could have 2 juices in the same tank and need fewer watts for one than the other.
More costly APVs arent necessarily more sophisticated, but they are built to last longer. I think a VAMO or something similar priced is the right way to go for your next step up though