Hi  @ArtyMarty 

Here is my recommendation:

Gateway router: ER707-M2

24 port Switch:  TL-SG2210XMP-M2

Wireless access point: EAP673

Omada SDN controller: OC200

*Omada gateways also have similar protection functions, such as URL filtering, Attack defense, etc.

*With the above devices, you will obtain a whole 2.5G network.  All devices are SDN Omada devices and support VLAN. 

ER707-M2 also has a USB WAN port which provides LTE backup with an LTE dongle.

  @ArtyMarty 

I would consider a DIY controller - take a look at my post here and read the discussion leading up to and following it if you have a few minutes.

OC200/OC300 are slow, have very little ram, and are really maxed out on the newer controller versions. If you're someone who hates clicking on something only to have to sit and wait while it loads (slowly), they're worth avoiding altogether. A 4GB Pi5, microsd, power adapter, heatsink, and case can be had for around the cost of an OC200. You can add an NVMe hat and an NVMe drive to boost boot times and responsiveness and be well under the cost of an OC300.

https://community.tp-link.com/en/business/forum/topic/528450?replyId=1368310

  @MrAdministrator 

May I ask what Nvme hat you use on your pi 5?

And case... 

Trying to work out which one and case to get, want to mount it in 1u rack with whichever router I get.. 

Thinking on a Argon neo 5, or an argon one v3 as they both seem to have good cooling for drive and pi built in. 

  @ArtyMarty 

I use 52Pi nvme hats, the N07 (bottom hat) since I have my pis mounted to a 2u din rail mount shelf and will be installing the PoE hats on top when they finally release.

The N04 is also good as the top hat model.

I tried the geekworm top and bottom hats but like the 52Pi better.

If you get an Argon case you won't get to choose a hat, however, as the nvme base contains the m.2 board. I would recommend against the One V3, its.. complex and unnecessary for something like this. It has a daughter board that runs an RP2040? that reroutes and manages power, HDMI, fan PWM, etc. and requires installing additional scripts just for basic operation. The Neo 5 is cheaper, smaller, and basic - the fan plugs directly into the onboard fan header so it's automatically managed by the Pi.

The argon offerings may both be too tall with the NVME base to fit a 1u shelf.