Depends what you forecast your month by month growth to be.
I use and started with a 24 port un-managed Cisco Switch for less than $100, which is a spectacular deal for a Cisco switch.
Spend the extra dollar and get a quality switch with a solid multi-year warranty.
If you pay upfront for quality, you won't kick your own ass later for being a cheap bastard.
Very high quality switch, just Google "cisco 24 port unmanaged switch best deal your country" and obviously put in YOUR own country...
Obviously they also make multiple 24 port models so don't panic if you see $5,000 switches...
Use sites like Price Bot or whatever, they find good deals fast.
You don't need anything else, I bought mine some couple months ago and is already almost full but I had forecasted a fierce growth.
If you got the buck, definitely go for a Cisco Unmanaged, anything else other than that might as well go DLink or LinkSys to save a few bucks.
My miners have their own internet connection and sub-network, so my personal data is never compromised from my mining operation.
Trust me, it's an amazing switch and there's random deal all over for them