No! It's not just for dripping. You can drip if you want, but you can use regular cartos in it or tanks or whatever you want. I think your "extreme" cartos are the 510 thread pattern, so you can use them as well.
The recommended resistance for the V-Tube is 3ohms. That gives you a wide range of voltages that are actually useable.
If you use a low resistance, say 1.5ohms, it will work, but it will automatically limit your voltage so that you don't burn out your carto. That means if you set your VT at 3.7V with a 1.5ohm carto, you will get 3.7V. If you increase it to 5V, you will still get 3.7V
So, it's really idiot-proof. I don't know what the resistance is of your "extreme" cartos. But worst case is that you'll be vaping at 3.7V, just the same as you were before. If they are higher resistance, say 2.5-3ohms, you will have a range of voltage to select from and will be able to produce more, and nicer, vapor.
Any atomizer with a 510 thread will fit. If you have, for example, a 808 atomizer, you can get a 510/808 convertor. I'm using one of those right now on my VT with an 808 cartomizer.
If you aren't going to drip, the only thing atomizers are good for is tasting small amounts of juice before you fill up a carto with a flavor you don't really like. Personally, I wouldn't bother. Buy 3ohm Boge cartos instead and you'll be golden.
You won't be able to get everything in one place. Get the kit from Apollo, but that's all. If you have a credit, maybe pick up some empty cartos if they have them, or some juice if you like it.
What you really want to do is buy a spare Panasonic 2250mah IMR battery for $9.99 shipped from Orbtronics. It's the best battery going and will outlast the stock VT battery by miles and miles. I can't recommend getting a spare battery from Apollo. They're o.k. and I've had no problem with them, but they're overpriced, cheap generic IMR's and only 1600mah or less.
Then, get some 3ohm Boge cartos from wherever you can. If Apollo sells cartos, they'll be better than nothing, but get Boges as soon as you can. You can find them for $6-8 for a pack of 5. If you have $20, you can get 15 of them, including shipping from several place.
Then, you'll be set. Apollo ships fast. I got mine from CA to FL in 3 days.