Hiho,
i have those two in my tank:
> "(..)if these were just old common plants with new names"
No, they are a new variety by the german plant breeder firm 'Zoologica'.
If you want to read (ger) something about them or just look at pictures go here
http://www.zoologica.de/
("Sortiment Arten und Zuchtformen" -> "Pflanzen-Portraits", Sorry, i can't link directly)
A lot of picture you can find here:
http://www.wolfgang-ise.de/echinodor...ie/frs_gal.htm
> How large does the "Crimson Sails" get?
not large, max. 40cm
> "(..)$60 for two sword plants."
I paid 8€ (10USD) for each plant

some years ago.
Both plants are easily to grown, they just need bright light
and a lot of fertilizer in the ground to show there colors.
Deep Purple is a kind of sick: the new leafes can go black (!!) to a deep purple to a bloody red and at the end brown. 'Crimson Sails' must ne a new name for the USMarket - here its called as 'Regine Hildebrandt', a very popular female politician in NorthEastGermany which died on cancer

.
It grows a bit slowly and (hearsay) doesn't like to get reimplant.
I hope, my schoolenglish wasn't to cruel for you.
bye