Does it have 1x VGA/DVI/HDMI/Component inputs, i.e all seperate?
Yes plus a couple of scart inputs that also do RGB.
If it has DVI, can it run 1920x1080 over it?
it definitely can through the HDMI VGA and component so I would expect the DVI would be no different. although I have no way of testing it for you.
Is that bottom speaker detachable by any chance?
Not sure, I thought about it too, however there is a metal U shaped support runs through it and up into the top part so would be difficult if it is possible at all. The stand comes off easily.. mine never made it out fo the box.
Are there seperate AV input buttons on the remote or do you cycle inputs?
in total there are 10 different input options including the tuner, so no, however there are 4 different buttons which control/cycle the inputs. one to select TV. then one for PC/HDMI/DVI one for AV/SV/component and one for Scart 1/2/2s. I have a Harmony Remote and a quick cal to their support and they created all the codes correctly so it can swap between activities perfectly.
Are there any fans/noise from the set?
No fans I know of.... totally quiet operation so far and it has been well used