The prices you see some places are crazy marked up. Depending on local taxes and how much a B&M wants to gouge you can get a lot of the regular Opus line for $10-15 a stick. Granted that's still expensive for most but it's not nearly the markup you see some places. There should be a batch out around Father's Day (I know some places already have their allotments) so keep your eyes peeled. Also, sign up for the Atlantic Cigar email list, they usually have a decent selection available online for a short time when they get released. They are marked up some but not crazy bad. Usually they limit you to two per vitola but if you are looking to try them it's a good place to start.

Keep in mind too, some people love them fresh, some say they have to be aged. It's all personal preference so you may want to stash a few for a couple years and see what happens.

As for differences between regular Opus X, Angels share, Forbidden and Destino, they don't share much on blend details. The only real difference that I recall ever seeing Fuente discuss is that each uses a different wrapper. Someone please correct me if I am wrong.

Now the Lost City, IIRC, came about thanks to Andy Garcia (the actor). He was making a movie about a Cuban family and wanted tobacco fields to film in but he was going to be filming after the harvest season. So as a favor, Fuente grew him a small plot in the off season and the tobacco ended up with unique qualities (so they say). From that crop the Lost City was born.

I've never had a Lost City but the rest are excellent in my book. However, I am a bit of a Fuente fanboy so take it with a grain of salt.