As someone else mentioned, Highbrow Vapor is awesome, and they've got a 20% off sale that ends today. I've used ratios from 100PG down to 50/50, and I have to say that I greatly prefer 60/40 or 50/50. Too much PG irritates my throat and sinuses, plus I like the amount of vapor that more VG produces. I'm actually going to mix up some DIY with higher VG percentages today to see how that goes.
Really it all comes down to personal preference. I would suggest finding a vendor with a wide range of ratio options (Highbrow will custom mix whatever ratio you want). After you find a flavor you like, order it in a few different ratios (for example 30/70, 50/50, and 70/30) so you can compare them side by side and see what kind of difference it makes. Good luck!