“No Bluetooth on the laptop, plus I want to be able to stream around the house without worrying about range/moving kit around and, once I do have wifi, the plan is to expand the system and do it properly…”
If you get a ‘Connect’, you will need a separate amplifier & speakers;
If you get a ‘Connect:amp’ you will need separate speakers;
If you get a ‘Play 5’ you don’t need anything else.
I don’t believe you *need* wifi…
There are 2 ways to connect to your laptop:
a) Analogue connection from the laptop line out to the line in on any of the above. They would act as speakers for your laptop, and nothing else. All playback control would have to be from the PC. You would only be able to control the Sonos volume via the buttons on the Sonos kit. Beware that the Sonos system introduces several seconds (ish) of latency, so you can’t have music direct from the PC audible at the same time as music from the Sonos system.
If you get a ‘Play 3’ or ‘Play 1’ (?) you don’t need anything else, but they only have ethernet connections, not analogue line-in.
b) Ethernet connection to your wired network (spare port on your broadband modem/router?). This would give you full control of the Sonos system from your laptop or any other computer on your home network, and give the Sonos system access to online streaming services.
Once one Sonos device is connected, you can add others, even if you don’t have wifi, because they use their own wireless network.
When you add your own wifi network, you open the door to using smart phones, Ipads, etc. to control the playback, and also playing music directly from these devices.
Beware the latency, again – if you plan on using the sonos system for sound when playing videos, you need to find a player that allows you to synchronise the video and audio.
HTH!