As I,m useless with computers and anything technical such as "where do I plug it in" I will leave that to others. The only thing I really know is you should buy the best one you can afford. I had only a vague idea that to look for so I splashed out £1400 on a high end gaming machine from PC World which has an option to select the best possible setting for games such as Trainz. It even works well on Kings Cross- Newcastle so I must have bought the right one. Now somebody will say "you could have got one for £500 which is just as good" but as mine works I,m happy. For 5 or 6 years I was struggling with a Dell 5150 which was a load of @@@@. I see you only have a small budget unfortunately which will make it difficult to get a suitable machine. So that is why I,m turning you over to the experts