I just bought the 64Gb model and a 2Tb drive (will be about a week to get delivered).
What are some essential accessories to pair with the steam deck?
More games that you’ll probably never play!
Storage! You are gonna need a lot more storage.
With a 2Tb card? I suppose if OP wants to download 20 100+gb games they would.
You’ve got the essentials but I’d recommend a USB C hub, this is the one I use which is pretty cheap - https://amzn.asia/d/36c6mp6
It gives you USB A ports and HDMI which is nice
If you’re in Canada, this is the one I got. Similar to that, but it has ethernet, 3.5mm audio, and VGA on top of what the other one has. I’ve also tested it, and it does allow charging via the hub’s USB-C port. https://www.primecables.ca/p-398125-cab-bs-hc101a-10port-usb-c-hub
I’d say you have the essentials already after getting your 2TB drive. With that kind of storage you won’t have to think about buying an SD card for a while (if ever). You might want to think about getting a case though. Preferably one with a kickstand. Mine also helped with the steam decks plastic shell being misaligned a bit leading to hard edges pressing into my palms. Other than that I’d say most of the (more) essential stuff is software related. Like getting decky loader and exploring its plugins.
You can buy all sorts of stuff if you have money burning in your pocket, but as far as essential goes, you’ve already got it all.
That said, you might want to get a multipurpose USB-C dongle, for connecting the deck to an external display, keyboard, mouse, ethernet and such. The Deck Dock is okay, but there are cheaper options with the same functionality.
I bought one Dock off Amazon (it may have been JSAUX but I think it was an even cheaper option) and it’s great if I just want it once in a month or do for downloading mods and stuff, it’s the only addon I bought so far and I doubt I’ll need more anytime soon