...Meaning, isn't the iPad capable of handling itself, without having to always plug it into another computer that has itunes?...
To add to what has already been said, other than IOS updates, I already use my iPad primarily without having to "plug in to iTunes." All my stuff is "in the cloud", so there's nothing on the iPad that needs to be backed up. I use RDP & LogMeIn to control various computers, Pandora for music, Stream2Me for viewing my DVR recordings, Google Docs, email is on Exchange, Gmail, Yahoo & Hotmail. As you can see, very little is actually stored on the iPad so very little needs to be backed up. This is the model that Google is doing with their Chromebook.
But of course, "in the cloud" needs constant internet access. But your descriptions of a "standalone device" aren't really about using the device without internet access, it's without a PC. However, as I've described, I've almost completely cut the need for the companion PC. (Just iOS updates.) The "in the cloud" model means that you're not really tied to any computer. Meaning, your version of standalone has local data that needs backing up, which the cloud model addresses. Since there is no local data to backup, it could be argued the cloud model is "better" since you don't need to have "Time Machine for iOS", so to speak. 😉 I can be on my Mac Mini, Macbook Pro, iPad, Win7 PC, or XP PC and still get all the same documents and whatever. Lost or broken iPad? With cloud there are no worries about "PLEASE HELP ME RECOVER MY FILES FROM MY DEAD IPAD!" 🙂
Basically, you want a "tablet PC." Bill Gates promoted this years ago but at the time, no one could get away from the need for a keyboard, so they were always too heavy, and since they were a "full PC", they have only a few hours battery life. So tablet PCs didn't take over the world like Bill predicted. Going to a much "lighter weight" OS (like iOS and Chrome OS) and the improvements in battery technology have given us devices like the iPad and the Macbook Air and we can see a better chance of a tablet being universal (but not necessarily a tablet PC.) But your "needs" are better filled by a "traditional PC" (i.e.: Macbook Air) unless you can change your thinking to the cloud or somehow beyond the "traditional PC"...for now at least. 🙂
To paraphrase what I've read elsewhere, don't make the iPad work like a PC. Make your work fit on an iPad. Most days you'll commute to work on a moped (iPad) and every once in a while you start up the SUV or minivan (PC) when you need it. (e.g.: carry a matress.) If you need to commute everyday with the minivan (e.g.: drive 5 kids to school,) then the moped really wasn't the correct choice. (Well, I guess you could have the kids in the moped's basket. 😝 )
Just my two cents. 🙂