qBittorrent bound to Mullvad VPN (Wireguard). For search I just use the built-in search engine in qBittorrent hooked up to a few services + Jackett, which has some private trackers configured.
BiglyBT for I2P-only torrenting. Using tracker2.postman.i2p for finding stuff, or importing a clearnet torrent and hoping I can find a peer through the I2P DHT, which works fairly often.
And Soulseek (Nicotine+) bound to VPN.
I start collecting new drives for expansion when I reach 80%-100% capacity of the current RAID drive. Currently reaching that point, nearing 60TB.