I really do like mixing benzos with my weed (and I do smoke good weed...locally grown - etc etc. *in ideal conditions* - thus switching weed [source] is not applicable as an option). However, I do not always do this --> only at night time. I take benzos every night to sleep (and yes, I have a dependence on them: however, it is not yet physical - ie. I do not get w/d symptoms. I am only psychologically dependent). I smoke during the day 1 - 3 times, and also at night time to sleep.
I also like to combing marijuana with opiates (I'm also an opiate addict: I only recommend that a non opiate user would mix the smallest of amounts, as opiate addiction or dependence is not worth the good feeling of combining the two (in the long run]). I'd say if one wanted to mix these (w/o a tolerance to opiates) to mix the weed with something like 5-15 mg Vicodin - depending on the individual, what they can handle, want to achieve, etc. , or 5 - 10 mg Oxycodone (either Pure Oxycodone ER/IR or combo, Percocet).
(and me personally: I love to combine weed, 50 - 80mg adderall ['Throughout the day'... to stay 'awake' or 'peppy'], Heroin [to not feel like dying - ie. to avoid w/ds], and 1mg clonazepam oooor 1mg lorazepam...or 1mg alprazolam - to avoid anxiety *IF needed*)