I have been setting up a system just like what you seem to be after. There is a threat on the old farm where people advise Aqua Man on the setup he had been planning. I got most of my ideas from there ("Planning out coco advice"). I would highly recommend that one. This is what I have learned:
Piping
You can go with PVC which is cheap and popular, especially if it is a permanent system. I went with 16mm PE pipe. It works with push fit fittings and is easy to work with. It can be disassembled easily. I am a fan of PE and would recommend it. For your size it is also cheap enough.
You should run a full loop for the pipe so the pressure equalises.
Pump
You don't need push water volume but a fair amount of pressure. Diaphragmatic pumps are cheap, reliable and produce a good amount of pressure. They are loud but will only run for roughly half a minute at a time. Mine does 4.3L/min 35psi. The brand is Seaflo.
Manifold
Floraflex looks pretty good. I have a Rainbird that I now run empty because the pressure regulating drip valves go up to 8l/h which is not enough and pointless for this endeavour. There is a simple 6x manifold that seems popular (in pic below). I'd go with that or the Floraflex.
Emitter
I initially got a cheap setup from Amazon for about 20USD. It wasn't terrible but I wanted more control. In the end I bought a set of the Floraflex Square Matrix emitters/trays. They are affordable and spread the water nicely. I have seen some experienced growers recommending open lines to avoid clogging but I prefer the way Floraflex spreads the water. It also reduces evaporation and reduces exposed surface for pests.
I have read a lot over the last few weeks. I have not seen anybody not be happy with Floraflex. Their prices are also decent.
This is an image I "found". It uses PVC (with threaded connectors) rather than PE. I put valves as risers which gives me two circuits I can control independently.
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