I don't think a vote will get you the results of which box of cigars is right for you. You have a pretty large variation of sizes and flavors in your list. How did you narrow your choices down to these six cigars? I think you are better off smoking one before blind buying a box. I can only offer you my opinion on your choices given my experience smoking five of the six cigars you listed. I wil assume that since you said, "humi", you will probably want to be smoking from this box in the very near future.
H. Upmann Majestic
I have never tried these (or even recall seeing them)
H. Upmann Royal Robusto
There are only 10 in a box, so this might not be your best option if you are on a budget. With that said, these are great Robustos. I am smoking from a 2011 box now and I have a '12 box in my locker. I will proabably purchase another one or two boxes very soon.
BBF
Some people will say these need some time to balance out or improve their complexity. I have only smoked pretty fresh ones and probably less than a dozen. I am not really a Bolivar fan. While these are technically Campanias, if you like the piramide shape, the Monte #2's are a top notch choice and are about 1/2" longer than the BBF. Three weeks ago I smoked one from a Feb 13 Box of Monte #2's that I received from Czar in July. It was really good for such a young cigar.
Bolivar Petit Corona
I used to smoke a bunch of these, but I haven't in about the last three years. At some point Siglo II's became my go to petit corona and that is the only PC I consistently buy. I also smoke and store Trini Reyes, but they are a bit smaller in size than the BPC. I think the Gold Medals are the only Bolivar I truly enjoy.
RASS
Robustos are my most smoked vitola. I smoke RASS, Trinidad T's, CoRo's, HDM Epi #2 and a lot of PSD4's. I think this is a pretty versatile size for someone who will devote a lot of his storage capacity to one cigar. The Cohiba's and Trini's cost a bit more, so those may not be a good choice. I have recently smoked out of a box of '13 Epi #2's, '12 PSD4's and '12 RASS. They are all great young. While I am especially impresed with the '13 Epi #2's, given only the options on your list, I would pick RASS.
Montecristo #5
I would look to # 4's instead if you want a small Monte. I burned through a whole box of #5's recently as I smoked them while walking my dog. The #5's are just too short at only 4". The shortest cigars I usually smoke are Reyes or Mag 48's and only when it is too hot outside to enjoy a longer smoke.
Of course, this is only my opinion and may greatly differ from your opinion. Since you did list six specific cigars, maybe buying 1-4 of each cigar is the best way to "help fill up the humi"