Just make Cannabutter first - oil is not as fat soluable as butter, and thus the THC won't bond as well as it will with butter. As for using 5 grams of good bud, what a fucking waste. While quality of the bud WILL show up in the edible, the difference won't be anywhere near as wide as it is when smoking.
there's a REASON why you should use shake or trim...or Vapor poo for that matter, it's all cheap and not really that smokable.