Go for DIY. Perfect investment if you intend to get rid of nicotine because you control all the variables. Tons of places sell starter kits. Get a couple flavors that mix well, especially in the flavors you typically buy.
Think versatile. For instance, if you like cherry cola vape, get cola and cherry separate. That way, if you need a change of pace, the cherry mixes great with things like cheesecake or skittles.