Hi Ram.
I'm a looong time user of the Esclapez open heel fins for much the same reason as you- the temp, though Dana Point is a whole heap o' warmer than Ft. Bragg.... I wear them primarily as my feet are size 13 US and yes, it is true what they say about guys with big feet...
So with the 5 mil boots and all, they're the only things that fit in a long blade and they work pretty well. I've broken some just from sheer work hardening of the plastic, but the price is right so I don't grip too much, though they have a habit of going South at the most inopportune times :head
If you also have big feet and like to keep them warm, they're about the best show going. Hell, they're the only show going!
I will admit to
really liking my OMER Millenium Comps with less sock in warmer waters, ala the Keys. I do have a pair also that I slit and made holes to lace them up using a sock inside, then the fin pocket and another sock over the whole shooting match, but it's a pain in the ass and getting them off to make an exit leaves my skinny out in the impact zone too long, so they're primarily boat fins.
A trick I do to keep the piggy's warm is to wear cotton athletic socks, then the boots and then the fins. The socks take up some of the slack in the boots, trapping the water better to warm up the urine, er water that collects there. If this works for you, you might be able to swing a full foot fin.
Incidentally, I'm being provided some new fiberglass monofins and "stereo"fins for an evaluation that I'll print here on DB so stay tuned. These things look like the better answer to affordable and ding-proof carbon. :king