Hey Ananth,
TRY buying locally if it's reasonable, in order to support you local dealers, and TRY buying from reputable chinese sources if you're hunting for super bargains. Personally, I'm somewhat addicted to chinese vendors, because I have bought amazing things from them for 1/3rd up to 1/5th to what they would cost me locally.
My recommendation for you: Joyetech Ego AiO Pro C (NON-TPD-VERSION!)
I use it as my out-of-house device, with no intentions to replace it with something else.
Reasons:
1) In opposite to your initial perception, Joyetech products do enjoy a rather good reputation. And their tube devices are very simple, sold in high numbers, and people find little trouble with it.
2) The Pro C has an exchangable 18650 battery. You can always carry a backup battery with you, best in a small vape case in which you store your device, battery, liquid, USB cable etc. It's unbelievably convenient. Plus, if your battery ages, just buy a new one. You can't do that with devices with in-built batteries.
3) When loading over USB at your PC/laptop, you can still vape at the same time, because of the device's passthru-functionality.
4) The Pro C gives you a good variety of coil choices. From the 0.25ohm notch coil for big vapor production on the one end, to the very restrictive 1.5ohm clapton coil on the other end. And everything in between. For MTL you have 0.6, 1.0, and 1.5ohm coils. For DL you have the 0.5 and 0.25ohm coils, and the BF-RBA head (see this video for instruction:
LINK).All of them do exactly what they're supposed to do. Plus, they're cheap to replace.
5) It's cheap and robust. It should cost you less than $20. Should you ever destroy it, you won't cry your eyes out. Yes, there are other tubes which carry more liquid, there are tubes where you can set the wattage power for your vape, and yes, there are tubes which look fancier than an Ego AiO. I don't care. For my out-of-house use, I won't conduct any unnecessary experiments.
Concerning liquids:
I don't know man, there are a million liquids out there, but I'm a simple man. I buy liter bottles of nic base, then I buy concentrated food flavors I like, then I mix them all up and pour them into small 60ml bottles for my convenience. That way, I pay roughly $2 for a 60ml bottle, when I would otherwise pay $8-10 for commercially premade liquids of the same quantity. That's why I don't care how much liquid I vaporise on any given day. Maybe you want to consider going down that route as well.