I don't mind which unit I purchase providing it gives me a good experience, and although I have no set budget,
I tend to prefer to buy hardware which sits in the VFM segment of high-end, if that makes sense.
I didn't realise there were 'base stations' involved, or, for that matter, different versions, e.g. 128GB through to 512GB.
Plenty to read up on.
It would probably be worth having a shot of a VR unit before buying, some people can get bad motion sickness from them. A lot of games have mitigating settings to help with this though and besides you get used to it.
Once that's ruled out, the next key difference for me would be the lenses; fresnel or pankcake. The latter can bloom a little in very high contrast scenes, but the large sweet spot makes it worth it for me and it's also a higher resolution. Also, the Quest 3 has genuine continuous eye adjustment, as opposed to three presets which may not match your eye positioning - although you can bodge it in-between the three presets.
If you are going to be mainly PCVR, then the storage size may not be quite as important. I got the 128GB version of the Quest 3 as I'm mainly PCVR, but I do have a few standalone games and it fills up fast, so I wish I had got the 512GB. That's not an issue now with the Quest 3 as it's only 512GB, but if getting the Quest 3s I'd be looking at the 256GB version.
Link to specs comparison (OC don't sell the Quest so I'm hoping links are ok?)
Argos currently have the Quest 3 (512GB) on sale at £445 and the Quest 3s (256GB) at £330 (Amazon have it at £320). It's only a little more than a tank of petrol difference for better spec and twice the storage.
It can be a little daunting at first when you fire up the Quest, but it's pretty intuitive. There's also other non-game stuff that is pretty cool including YouTube videos in 180° and 360°, pretty cool 3D animations, 3D documentary type stuff and you can even watch 3D movies (although it's a bit of a faff). When it comes to PCVR, it can also seem daunting but there's tons of help around and it's much better now compared to back when I had the Quest 2. Oh, regarding PCVR, if doing it wirelessly then it's highly recommended to have a dedicated router for it and ideally WiFi 6 rather than using the shared household one. I went with the ASUS TUF Gaming AX5400, but that was almost four years ago.
Good luck with your VR journey should you start it.