Currently using the following

e.nos.lol

nostr.fmt.wiz.biz

nostr.pleb.network

nostr.plebchain.org

nostr.w3ird.tech

nostr.wine

relay.current.fyi

relay.damus.io

relay.lexingtonbitcoin.org

relay.utxo.one

Still testing things to ascertain the right approach. May end up just being one relay per polling implementation.