At the moment I'm trying to do a bit of research before I take the DIY plunge. If I plan on making Max VG juice, I should buy VG based nic right? and is there anything I would still need a bottle of PG for?
Yes, VG based nic. If your trying to achieve the MAX amount of VG in your juice you would have no need for PG. The reason most companies offer Max VG instead of 100% VG is because there is PG in their flavorings.