I would definitely advise not getting the Blu system. I started with one myself, and quit vaping shortly after. They have a couple flavors that aren't horrible, but the batteries don't last long at all, and they don't really produce much vapor. To me I didn't get enough nicotine either, they just made me go smoke a real cigarette.
I'd suggest looking at something like an eGo Twist. It's not much more than a Blu if you buy the starter kit, you can use a wide variety of tanks (atomizers, cartomizers, and clearomizers), the batteries will last longer, and you'll have a much wider variety of flavors.
Also with the twist you can adjust the voltage. What this does is makes the juice burn cooler, or hotter, this way you can make some adjustments to the flavor and overall feel of the vape. Variable voltage is really almost a must have, because different juice vendors make their juices differently, and they all seem to burn a little different.
If you don't mind spending a little bit more, I'd suggest either an eVic, or a Lavatube. They're a bit larger, but have a lot of really nice features, and a lot longer lasting battery. Its really nice to be able to fill up a 3ml tank, and vape all day without any hassle
The only downside really, is that depending on where you live, you will probably have to buy your juice online, which really isnt much of a hassle. You could always pick up a disposable Blu e-cig and give it a try, but I must warn you, the disposable version lasts 100 times longer than the rechargeable ones. My rechargeable ones lasted from 2 to 4 hours, and that wasn't even with constant vaping!
If you go the juice route, check out Kick Bass Vapor. They make an excellent e-juice!
Hope this helps, and good luck!