Most of the drip tips will work with any of the 510 or 901 atty's/cartos unless otherwise specified (306 or eGo Dual Coil). The acrylic drip tips are fantastic but it's really your personal preferences. You may prefer aluminum, delrin or plastic. As far as which atomizer to get...again, it depends on what you are using it with. For a basic e cigarette (pen style), stick with attys that are 2 Ohm and higher but no more than 3 Ohm. An eGo style or 3.7 volt
mod, you can go with a lower resistance atty like a 1.8 Ohm or higher.