Recommendations will be based, in part, on where and how you plan to use the device. I have a Vaporshark and a Sigelei 100 and they're both great, high quality devices, although they serve two different functions for me. The Siglelei is my home/desktop mod used mostly with drippers. The Vaporshark is my on the go device and it's almost always topped with a tank, sometimes with a kanthal build, sometimes with nickel.