What you just described is a desktop computer. It would probably be cheaper to just get a desktop then spring for a separate iPad. At least I could use one while using the other instead of losing my "screen" when I want to take the ipad out of the house/office.
So in other words the OP wants to gimp their computer by making it rely on an ipad for a screen.
Flash was needed maybe 6 years ago. Look to the future where we don't have to rely on a buggy bloated plugin to watch a video. Really, no site that relies on flash as their main interface is worth browsing nowadays. I don't need animated menu buttons and crappy music to get information.
If anyone can name some sites that are pure flash that they regularly browse, I'll tell them how irrelevant those sites are.
Umm, Youtube?! Duh! And I make money off Youtube, that is why.