since we're on the topic of DIY juice what exactly would I need to make my own? I've never done it but have wanted to give it a go. To make it easy lets just say I wanted to do one flavor that is 50/50 with 8mg of nic.
To start go to the DIY forum and read the stickies, there's lots of great/important information there.
Second, download a good DIY calculator like ejuice me up and play around with it for a bit to see how changing one variable effects the final product.
Then you can order your supplies, which you will have a much better grasp of after the reading. The easiest is to order your base pre mixed to your specs as far as nic level and PG/VG ratio. Remember when you add your flavoring it will dilute the nic level. I've found NN to be, to me, the nic of choice and as Tom and others have mentioned, to also have some good flavor concentrates (as well as bottles, mixing beakers, etc), pretty much a one stop shop.
As you get comfortable with it you can start ordering your base materials in bulk quantities and making your own. That's where the savings really start to kick in.
As far as what Flavors to use and at what percentages, that's where the fun of DIY lies. Start at lower percentages and work up till you find your sweet spot, which can vary wildly depending on the individual. Often in DIY, less is more.
DIY is not only fun and rewarding, with the looming FDA decision it may become essential.