An atomizer wont work with a tank... unless you go with the ego tank setup, which is a 3 piece batt/atomizer/tank cartridge..
If you want an atomizer in a tank, you can look at clearomizers... vivi nova, raptor, stardusts, kanger t2/t3's etc...
If you are any good with electronics, you can go with a rebuildable... there are several rebuildables out there, including affordable genesis clones... (most real genesis type atomizers are $100+)
With an ego, Id just grab a few stardusts (vision stardust v3 are the ones I have). I plan on giving Kanger T3's a go, which are a bottom coil clearomizer design.