Well I pulled the trigger on some DIY stuff, vg, pg, nic, various syringes, couple of flavors all just under 50 bucks. Normally I spend about 70 a month on joose.
I think you will enjoy DIY. MUCH cheaper and make what you want not what someone wants to sell ya. And yes some mixes will not turn out so good. Just keep good track of the ingredients so when one works well you can replicate it.
I started with those two myself. No RY4 for me. Don't like it.I'm keeping it simple for sure, just raspberry & blueberry at first then maybe some RY4 experiments down the road.
Once you get into more complex flavors, like Robert said, keep track. My latest effort is just a substitution of one flavor from my flamingo tutu tropical cherry. And it's just as good. I substituted the black cherry for the blueberry.
I have a fuzzy memory of people commenting that they were getting provaris with the outer vent holes and some were not about the time I ordered my first. That was in February or 2014. Now they're doing box meds. My how time flies.

Oh, listen, I talk so big... no, what would REALLY happen is I would throw it at Rich and tell HIM to do something about it! 
A girl can never have too many shinies (even if some of 'em aren't precisely shiny).