OP yes screen, speaker, keyboard, mouse all re-usable. Buy a tower / box to replace yours. Suggest also you by an external usb caddy as I bet there is a decent your old hdd you can still use / see as an external drive. Once you get everything off it (I saw on other thread you have done a bit of that already) you could reformat it and use it for backup.
You might look at a Tower/box with say a 250 SSD which is much much faster and keep other bulk stuff in external drive ?
You might consider a box with hdmi out (not sure if thats laptops only) then you have the option to use machine to drive content to your tv or look at chromecast, lots of options these days for media content online and send to tv
Happy shopping