Ive owned both the blackwatch and the xikar...
the xikar is much better built and is a much nicer case... but...
the blackwatch is MORE THAN ENOUGH protection and seal to accomplish just about anything you would want to do... I took mine all over the globe (on some super rough flights into some very austere locations where it got the hell beat out of it).. on trips lasting as long as 3 weeks.... it performed flawlessly.. and a single boveda 65 kept everything nice and fresh for the entire trip.... I later bombed the case out to a good friend of mine (and fellow board member here).. who promptly took the case to Afghanistan.. where it continues to serve its intended purpose without any problems at all...
I wouldnt recommend you purchasing the blackwatch case from CI though... the list price at fieldsupply is slightly cheaper... but more importantly.. fieldsupply normally puts these cases on sale a couple of times a year... I picked mine up for $19.00... if you have until december before you have to make a purchase.. I'd just watch their site and try to grab one the next time the put them on clearance..
http://www.fieldsupply.com/general-store/packs-bags/dry-boxes-tough-cases/megilla-6700-12-waterproof-drybox-case-layered-foam-black-2.html
they'll list it under a couple of different names.. black watch, black ops, megilla, herf-a-dor, etc.. but its all the same case.. same manufacturer.. same product.. etc.. just different companies selling it...
tupperware is a good option as well... my first "traveldor" was a $7 piece of snapware I bought at target.. I filled it with 3 pieces of fluted foam that I picked up at cheaphumidors.com that cost about $3 each (IIRC).. all in the thing cost me about $15-$20 including shipping.. and it was a reliable 30 count traveldor.. that took up about 50% of the space that the blackwatch 40 count box did.. (something to consider when you are trying to find space for the box in your carry on bags... 2 of the tupperware options... and youre up to 60 cigars.. for barely more money than the blackwatch option.. and considerably less than the xikar option..
I cant remember who on the board I bombed the tupperware out to... but it was fairly recently (within the last 6 months).. they might be able to show you a pic of it... was a very good solution.. I just didnt need it anymore.. so I let it go to someone that could use it.....
one last thing to add.. the blackwatch case has 40 slots to hold cigars.. each one will hold a churchill +... so.. if you are smoking smaller sticks.. you can get much more in there... for example.. you can easily fit a couple of illusione rothschilds.. or tat PCRs... or nub habanos.. etc.. in a single slot.. and get as many as 80 cigars in there (again, assuming you tend to smoke smaller length sticks)..