To be honest, what you're planning on doing is completely unheard of.
The minimum requirement for all universities in the UK are 3 A levels. A lot of ex-polys will let you in with 2 A2s and 2 ASs but by the sound of your post you're ambitious so you probably wouldn't be looking at these sort of unis. With reforms as well, an AS level is only worth 40% of an A level so I'm not sure if unis would still do that. Many good US unis would be familiar with this structure and even if they wasn't it takes a quick Google search to understand it.
If you want to look at the A levels most relevant to Computer Science and programming then look at A level Maths, Further Maths and Computer Science. Physics is the next relevant and then Chemistry so if you enjoy either of them then definitely study one of them. Studying a fourth will probably improve your chances as US universities emphasise breadth rather than depth in their courses.
Don't bother looking at ICT as well. Also I'm baffled to why you think studying an A level in psychology could help you become an entrepreneur?