Well im gonna put this simply. To avoid screwing yourself over in the future, just go with an iPac 2. It's affordable and works the best of the 3. The difference it would make is that it's already there. Thats all. If you think you can easily load the files in on startup, thats fine, no difference. Its just nice to know that your keys will ALWAYS be there if your computer goes down or something. Also, lets say you get a new computer or bring just your panel to a friend's house, you can use it with your default keys already there. You plug it in as a keyboard and you're off to a flying start, whereas it would take you 15 minutes to get the programmer, get your keys coded, and start playing. Im aware this won't happen often, if at all in real life, but it's always nice to know.