I have 3 Broadcast monitors and a Consumer Sony Trinitron. The Broadcast monitors are imho miles better for retro consoles, especially the consoles that output a 240p signal.
The most popular Monitors are the PVM/BVM from Sony. There are other's also from JVC, Ikegami, Panasonic Barco etc.
I have 2 Sony PVM's and a JVC. The JVC is the one i use as its picture is outstanding and the geometry is near enough perfect.
If your going to go for a monitor and its a Sony I'd try and get a BVM if you can, if not a 800 line PVM.
BVM model to go for is the BVM-20F1E. This is a 900 TVL monitor. It needs a control panel to operate. This can be built in or separate. Make sure it has the control panel or its useless.
PVM models to look for are the PVM-20m4e, PVM-20L4, Or PVM-20L5. These are all 800 TVL units. The 20L5 will also except a 480p signal and is the one to go for if you can find one.
JVC do some nice models but connections are configuable via boards so you might not get one with any RGB input connections. Stick to the PVM/BVM's.
Regarding connections, They will have BNC connectors. You will need a BNC to Female scart cable to hook up your consoles. The connections will be split like this, R,G,B,Sync & Audio. You must have sync connected or you will not get a stable picture. SYNC signals is a topic all on its own and can be a pain with some consoles.
You will want a console that outputs RGB. Some might need modifying, others just need the correct RGB scart cable. SNES and Mega Drive are RGB out the box so i suggest maybe starting with those first.
Thats all i can think of for now. If you have anymore questions please just ask and i will try and answer as best as i can
Pic of my JVC monitor running a Snes Mini Through Scart. Amazingly this monitor cost me 99p

