I got the TC60W with Melo 2 kit (Eleaf) and absolutely love it.... then my wife tried it, and got one, then my daughter... it's a very nice looking device, sleak, extremely comfortable to hold, and well, there's nothing negative that I can say about it.... it's as near perfect as a mod/tank can be, at least it has been for us.
As I don't know what stores you'd deal with on buy online, it's sold directly from Eleaf for 70$, or 77$ with battery
iStick TC60W Bundle B - iStick TC60W - iStick Series - E-Cig
I would recommend getting a few extra batteries and a charger though. And don't forget to get extra coils....
That would be well in your budget and lots left over.
Alternative, there's also the Pico (66$ no battery), if you'd like a very small mod (with Melo 3 tank)) with even more options (SS and other systems, and is a 75W)
And they take coils that are inter-compatible with a bunch of other brands too, Aspires, Vaperasso, etc. I use the Vaperasso, BUT I've started to rebuild them (very easy) and have been fantastic.
I checked many brands and types before going with it.
The Kangertech have been popular but on my Facebook vaping group, I see a LOT of them being trade off or sold, so that kinda tells me how they aren't all that great.