Hi BenS, I'm in the middle of my build and I have talked to a lot of members here and searched countless posts to learn all I can for my build. I am using Honeywell standing pilot valves to control the HLT and MLT burners automatically with a temp contoller, thermocouple and auto gas shut off for safety. The reason I and others, are using low pressure is that the Honeywell valves are only rated for 1/2 psi (.5) and that is it. The valves can not handle high pressure. So if you want to automate your system later with a Love or Auber temp controller and you want to use Honeywell pilot valves your choices are low pressure, or low pressure.
Here is a link to check out:
The Banjo burners will work but make sure you get a good regulator and if possible needle valves, to have a wide range of control on the flame height. The Banjo's come in both high and low pressure and many people have used them. Many also have used the smaller ones you have posted and others use the BG-14's on their HLT and Boil Kettle but the smaller one for the MLT.
If you went with high pressure now and a good adjustable psi range regulator this may be cheaper now since you don't want any automation. High pressure should work excellent for you when used manually with high pressure burners.
You could always use a low pressure orifice on your burners later or drill out the orifice to make them low pressure and keep the same burners, if you decided to build in automation with temp controllers, and went with Honeywell valves in the future with low pressure.
Kladue, and Sawdust Guy are two extremely knowlegeable members that come to mind and maybe they can chime in or you can always send them a pm. I hope this helps a little and good luck with your build.............