This is definitely a good place to ask your questions. Just be prepared for a variety of different answers/suggestions.
Before I give you my answer/suggestion/recommendation I will give my disclaimer: Sub-ohm vaping and blowing big clouds is an different technique than you might be used to. With your original setup and what you have now you are probably a MTL (Mouth To Lung) vaper, similar to taking a drag from a cigarette. Most sub-ohm vapers and big clouds, for the most part, require DTL (Direct To Lung) inhaling; you actually inhale as you suck in vapor. It takes a bit of getting used to and it is quite possible your gag reflex will kick in, but it is something that you can easily get used to if that is the direction you want to go. You may or may not like it and everybody is different.
Now, on to the answer/recommendation. I don't have a SMOK Alien, but a friend does and she loves it. I've played around with it and I am seriously considering getting one for myself (because apparently 8 regulated mods just aren't enough). If you can get the SMOK Alien Kit, all that much better. The tank that comes with that kit is the TFV8 Baby Beast and that is a top notch tank in my opinion. I own two Baby Beasts and have at least one in my rotation every day. If I had a third thumb and could give three thumbs up, I would. Since I don't and I can't, then it gets a hearty two thumbs up. Awesome flavor, awesome cloud production. It comes with two different coils that are as different as night and day even though the ohm rating is similar (might even be the same). I have my preference in the coils, but I recommend trying out both if that is the direction you go. Also, if that is the direction you decide to go, shop around. Online prices range anywhere from about $50 to almost $70 for the kit. Make sure to include shipping and any taxes when you calculate the expenses. I don't think the VT store has that particular kit, but @Christopher might be able to get them in. In any event, it's a good kit and if you shop frugally you will be able to get the kit for well under your $100 price point and still be able to get batteries, a charger and possibly some extra coils.
I also encourage you to research as many different mods as you can, wait for other recommendations from other members around here and definitely continue to ask questions on the forums. It's always a good idea to hit up the online community to gain a wider perspective than simply going on the advice of someone working at a vape shop. In your case, yes, the employee made a good recommendation. But there is always the possibility the person behind the counter may be under direction to push a certain item. The online vaping community won't steer you wrong because most of us are just normal people with regular jobs not in the vaping industry. If we like something, we'll tell you. If we don't, we'll tell you.