Well, I?m not a video jockey, I?ve had some experience in Karaoke?s but my main knowledge in this subject comes from prior Djing and that?s being a bit of a computer nerd..
Firstly you need to weigh up the pros and con?s from both sources, for example a projector can plug straight into your VGA output on a laptop and broadcast the images to your audience however projector?s do not show great detail and furthermore you can get the annoying person shadow or even worse HAND PUPPETS!!! Also you have to purchase new bulbs for the projector which can be quite pricey depending on your model. So the advantages of a projector: Quick and easy set up and you can display a very large viewing window, disadvantages include lack of quality, shadow and hand puppets, replacement bulbs and you need a good blank surface to project on which isn?t always available.
Now LCD, well if you?re going to purchase some LCD?s make your life easy and make sure the TV?s have PC Input (VGA) this will help you GREATLY as you do not need to buy a VGA-Constant Video converter, all you need to buy is a splitter which split?s the VGA signal up to 8 times allowing you to show your content on up to 8 TV?s. Advantages include far clearer quality, looks far more professional but the negative is the price of the TV?s, transportation and set-up time (I assume)
The splitter can be found here:Maplin VGA Splitter
Now the ?software? that you mention? you do not need ANY software to set up external monitors or projectors to a laptop or PC with VGA output. If your machine is relatively new all you have to do is plug the VGA input to your laptop or pc and you will be prompted that you have attached an external monitor and you?ll be asked what do you want to do? If you use your laptop to DJ all you need to select is Extend my desktop right and press apply. Then you are ready to broadcast all you need to do when you see your desktop on the external monitors is click the top of the window and drag it to your right literally of the screen and it will appear on the left side of your other monitors.
I hope this helped.