Which ones are you looking at/thinking of getting?
I've gone through some trial and error with this for awhile, and for someone just starting out, I would recommend the Kanger Protank 2 Mini with a variable voltage battery. The "Ego Twist" battery is a great option, as it allows you to manually set which voltage you want (up to 4.8 volts) in order for you to find your sweetspot as far as vapor production and throat hit goes. As for throat hit, other factors also come into play, such as nic-level and amount of PG etc., but which battery you use is also of extreme importance.
With that setup, you will have set yourself up for a pretty damn good vaping experience. It produces lots of vapor and the throat hit is pretty damn good. The pricing on those items are also very decent. I think I paid 14 dollars for my Protank and 15 dollars for the battery. Both will last you a very long time.
Whatever you do, don't buy those entry-level, ultracheap, disposable ecigs. They simply don't measure up.