K, so if they got the color you like with a 2.0 Boge (seems he has a few of those) snag that, then go buy yourself a few packs or at least one pack of boge 3.0 cartos elsewhere, as when the carto that is included dies, you can swap it out for whatever you like (as long as it fits and another boge should indeed work).
Hope that helps.
Worse comes to worse, grab the color you like, get a few 3.0 ohm boges elsewhere, put the Smoketech in the spare parts drawer for a rainy day and start off with a 3.0 boge (or whatever you prefer).
EDIT: Just be aware that the tank will either be 3ml or so in size for regular cartos (doesn't matter if it's the smoketech or boge) or the 5ml version marked as XL which is taller and will require a bigger carto (boge xxl for example).
Suggest you get the regular sized tank to start as you can still use it on a bigger carto but you can't use the bigger tank on a regular sized carto.