32GB is preferable to most, for upcoming changes that may stress the network a bit. Future proofing, I guess.

I paid for a 64GB on Privex (since they allow payment in SBD), and then I paid @someguy123 to set it up for me. A bit more than one would need so soon, but it was in a budget that I was comfortable paying.

If you will do it yourself, @someguy123 has a good guide here; https://steemit.com/steem/@someguy123/your-guide-to-setting-up-a-witness-server-steem-in-a-box-hf19

Best of luck!

_Rob