Benzos and other downers are potentially a life threatening and dangerous mix. I do not advocate the use of benzos with other CNS depressants, although I am a user of the combination recreationally at some times, I have almost overdosed once from the combination and had to pry myself awake.
There is a certain something missing in a benzo high - but this isn't true of all benzos. For instance, I've found flunitrazepam comparable to an opiate high, if not actually better. I would happily choose that benzo over taking opiates anyway, however it's so incredibly difficult to source and I only came across them as my mother had a prescription for the 2mg tablets dated 1999. Since never been able to get my hands on then.
If you're looking for something extra in your benzo high - and are willing to try opiates, I suggest a very low dose of codeine to synergise with it (say 30-50mg). However, I have never really enjoyed weed, but the most pleasurable and enjoyable experiences I have had with it was on benzos. I loved mixing cannabis with benzos as it took away all the horrible effects such as paranoia and psychosis and made the high very smooth and enjoying. I would have to take an enormous dose of benzos to counteract those side effects though and normally found myself falling asleep pretty quickly.