Hi Ralph, I don't think the moderators in here are too happy about recommendation of specific drugs, even when the parameters of what you are looking for are so well described. There are numerous benzodiazepine equivalency tables available both on Bluelight and online that compare all benzodiazepine derivatives currently used in world medicine, including their equipotency to 5 or 10 mg of diazepam, and the half lives for each parent drug and it's active metabolites. There are also benzodiazepines that we now class in the UK as Novel Psychoactive Substances (NPS) - the group of drugs formally classed as 'Research Chemicals' which are now illegal to supply, import or export domestically
However, many of these 'RC' benzodiazepines are still available in many other areas of the world, and include among them possibly the most long acting benzo derivatives to be ever be used by humans.
If you were to have a look at some of those compounds, you can then frame your question around, as an example, 'are a-pam, b-pam and c-pam among the most long acting benzos and which would be the most suitable for x,y and z?' rather than simply asking, 'what drug should I take', a question that is rarely entertained if at all on this website.
Also, once you have found some compounds you may be interested in, you will also probably find that most of them already have a 'Megathread' devoted to them which are generally among the most comprehensive discussions on the web about specific drugs and should answer most of your questions, for instance, here is the link for the 'Flubromazepam' (an 'RC' benzodiazepine derivative that was discovered by Roche in the 1960's but was never developed into a medicine) 'megathread', which discusses the drug over 26 pages of posts
http://www.bluelight.org/vb/threads/654337-Flubromazepam
I would also advise that you have another read of the Bluelight User Agreement (BLUA) that can be found here:
http://http://wiki.bluelight.org/index.php/Bluelight_User_Agreement_(BLUA)
Please don't take ths post as condescending or critical, I just wanted to point you towards why there's a 50% chance this thread may be closed and I didn't want you to leave completely empty handed