Hello Wolf,
The UFS is great, you will enjoy it im sure! The only atomizers that I prefer to use in my UFS are genuine
joyetech 510 LR atties. Clouds Of Vapor sells them, here is a link.
Joye LR 510 -Steel
They are out of stock right now, but I am sure that after the chinese new year they will get more in. Im sure you have heard but Imeo is making his own 510 style atomizer that will work perfect inside the UFS. Its called the Achilles in and according to Imeo should be available to pre-order sometime in March after the Ithaka is finished. Keep an eye out for that!
- Clint