 Re: I would like a seahorse....
crap. Oh well 
They are not all captive bred. There are still plenty being wild caught, sadly, they don't do well, usually have parasites or disease, and do not take to anything but live food, usually. Always exceptions of course!
The one I am looking at, the capensis, I believe is/was on the endangered list. I am not really sure how that applies to CB, I guess it is OK to buy them if they sell them on line, captive bred only.
Yeah, some are pricey...the dwarf ones tho are only 2o bucks! _________  I Love My Sig By John Hawkins!!!!!!!!!!!!!
Date Started 9/04 58 gallon Oceanic Tank, 20 gal DIY sump/fuge w/ Kent Marine Auto top-off, Air Water Ice RO/DI, 10,000 K 175 W MH, 2 VHO 03's 96W each, AquaC EV 120 Skimmer
80 lbs LR, DSB in FUGE, 1 - 2 " LS in tank
Black Brittle Star, Chevron Tang, Crocea Clam, red & green Lobophyllia, Frogspawn, Porites Frag, Caulastrea Frag, Green Ricordia, Asst. Zoas, hermits, astreas, stomatellas, fighting conch | 
I like the h. erectus because they are medium sized which makes them quite visible. They were also captive raised so feeding was a piece of cake. I don't know anything about the other species you mentioned because I've never kept them. 
