I don't have any to add to the list but I will say that out of the non-business Southwest Rapid Rewards cards (Plus, Premier, Priority) that the highest level one is the best provided you spend money on a flight or hotel thru Southwest at least once a year, especially if travel is out of the country. I'm not saying it's the best overall credit card, just within the non-business SW cards.
The Priority has a $149 annual fee, the Premier is $99, and the Plus is $69. You get points on the anniversary and if valued at a conservative penny/point (which some places will value them higher at 1.5c+) this breaks out to $75 for Priority, $60 for Premier, and $30 for Plus. Note that the Plus does NOT cover foreign transaction fees while the Priority and Premier do. All three have the 40,000 point sign-up currently - which is a big drawing point of the SW cards in general.
The debate between Premier and Plus is even if you only look at annual cost plus the conservative value of anniversary points. Add in the no transaction fees, though, and it makes the Premier the winner out of those two.
Comparing the Premier to the Priority - the Priority is a no-brainer as you get an annual $75 Southwest credit (this is where the spending on at least one flight per year comes in) which more than makes up for the annual fee difference plus the extra anniversary points. Adding in the 4 free upgrades to A1-A15 (when available) is an okay perk provided the flights you use them on don't have too many pre-board passengers.
Thus, out of the non-business SW: Priority>Premier>Plus
Also side note: the 2 free checked bags policy doesn't usually apply to me but is still really nice for the occasional longer trips - but the real value in flying Southwest IMO comes from the no change fees and the ability to change a trip basically an unlimited number of times right up until 10 min before departure. This includes being able to re-book the same exact legs of a flight if there is a price decrease and getting money back - I did this yesterday for 4 different trips (1 vacation, 3 work trips), saved $170 on one, $17 on another, $35 and $35 on two others - all this just to book the same flights I already had and you don't have to "give up" your initial reservation spot in order to do so.