I would also suggest an ego twist. It is a good solid e-cig. Very well made and the stainless metal is nice. It is not difficult to hold and is good for using in the car/home. I got the joyetech brand, and the joye fast charger, since they are a solid company and have a warranty. I have an ego c kit, but it would not allow me to use a tank, it would drain the battery. And if I used the cartridges and atomizer that came with it I only got a burning taste. So I bought a few clearomizers that would work, and bought the ego twist to use with a tank. I also found a drip tip was a good thing to have, so that my mouth was not so close to the juice, when using a cartomizer, the metal sometimes gets really hot. I am not sure of the resistance of these items. I got regular resistance to go with my set, but maybe someone could clue us in on the electrical or resistance without confusing me? I would really like to know why the clearomizer Kanger eGo CE2: 2.5ohm and 1.8 ohm drains my ego c batteries! And why I get only a burnt taste using the new cartridge/atomizers that came with my ego c kit. It is not a joyetech product. I got it free from ecigadvanced by earning 200 points in their forum. Very easy to do, and it's a good kit for backup.
Avid Vaper has the Crystal Vision Cartomizers for the Ego style Batteries for 2.99, and it's rebuildable. Or any of the stardust, vision clearomizers would work well. I like to be able to take them apart to clean. Good Prophets has the 650 mah Twist for 23.99 and a dollar discount if you buy 2 or more. Their fast charger is only 4.99 and I already have a wall charger. They had the kanger clearomizer on sale for 2.99 and these have worked well for me on my twist. Also their ejuice is on sale for 1.99 for a 10ml. Just make sure that your ejuice does not contain diactyl or any of those chemicals. Perfumer's Apprentice and Flavor Art both have info on the types of butter/custard flavors to not use in juice. There is a lot of info on this forum for mixing your own. And check for vendor codes on this and other forums for a discount. The one I used for Good Prophets is tvcfriend for a 5% discount. Check the list of discounts on this website: ecigarette-mods.com/info/coupons/ has coupons. You should also research price and shipping from several stores before purchasing. I liked Good Prophets, they sent my order same day, on a weekend and I got it on Monday, it was only one day! And shipping was free for over $35 orders, but I don't know about costs to Singapore. Also check all the ejuice vendors to find something that you like at a reasonable price. I have tried several sample packs from companies to see if I liked their juice, the cost varies from $2 - $12 for a 10 ml bottle, so shopping around is a good idea.
So to seeing which way to go, what to buy is up to you and your personal tastes. Since you are going to quit smoking, then you may want to invest in a good kit, and get one to last you. Get 2 batteries, so you can have one while one is charging. The small cigarette type ones are just not strong enough to last and get enough smoke. A lot of people start there, but end up getting a better one latter. I didn't want to waste my money so got the ego C and twist. It is a good kit, if you get the clearomizers. Watch videos on youtube. They have good reviews and good info too. Good luck to you, you can quit for good! I smoked for 40 years, and have quit since Oct 13. I am not having nicotine withdrawals, and have no interest in cigarettes anymore!