Need recomandation to proxy+captive portal

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Hello everybody,

I want mount pfsense on a box for use  captive portal + proxy (squid,squidguard,lightsquid) + VPN

The number of max user behind is apromitavely 50 but most of time they are just 10 or 20 users

I suppose that this package consumes CPU and memory.

I would like to knows the best device for this usage.

I was thinking take apu1c (2 GB DRAM) or  apu1c4 (4 GB DRAM).

Do you think is correct to my usage ?

Thanks for all , sorry for my english