I have a Lavatube. One of the best things about it is that you don't need a bunch of different resistance cartos. All you need is 3 ohms. That will give you the full range of voltage without exceeding the 2.5 amp limit.
Get 3ohm Boge Cartomizers. Get a couple of 3ohm atomizers and a couple drip tips. You can drip into the atomizers to find out if you like a flavor before you commit a cartomizer to a flavor you don't even like. Cartomizers can be cleaned, but it's really not even worth bothering and it does't work right half the time anyway.
The standard resistance cartomizers are from about 2.5 to 3.2 ohms, but there's not real use in getting 2.5ohm cartos. You can get all the power settings the machine can produce by using 3ohms and adjusting the voltage to your taste.
Get plenty of cartos and save your $$ for juice samples. That's the hardest thing to nail down. When you find some juice you are really happy with, then spend money trying tanks and clearomizers and all that other stuff. Unless you know what kind of juice, the VG/PG ratio you prefer, you don't know how any of that stuff is going to work for you. Boges work with pretty much anything you put into them. They're cheap, reliable and consistent. That's what you need at this point.
BTW, apolloecigs.com has about the best prices on a Lavatube. They call it the V-Tube. Use the discount code "Thankyou" and you can get 10% off your order, free shipping and a one year warranty. They also have 3ohm cartos available. If you can wait about 2 weeks, they have a stainless steel model shipping then that's to die for. Don't forget a spare battery.