As an alternative to Apple, have you thought about any android devices? If you really like the idea of taking intensive notes, I really can't say anything will be as good as the Samsung Galaxy Note 10.1 (I'll be picking mine up in a few weeks assuming I don't get it for Christmas). The designated stylus is great since it is an active wacom digitizer so the writing will be natural instead of junky. Now I am not an artist at all, but there seems to be really good integration with the device. You can take a screen shot of your screen, adjust the size of the image and insert directly into your notes and then annotate it. It's the first tablet to offer decent multitasking ie watching a video and taking notes simultaneously. It's a really amazing device to me. It's not retina display quality, but honestly, I doubt I will notice.
Some other alternatives:
Microsoft Surface RT (or Pro). The advantage of the surface is the integration of the Windows Suite (Excel, Word, PowerPoint, OneNote, etc). I believe they might be slightly watered down for the RT but in all honesty it should get done whatever you need it to. It has the nice keyboard which locks right into place. I believe the pro version might have a designated active digitizer which would make this a pretty beastly device.
Asus Transformer Infinity. The infinity is nice because it has an optional (why wouldn't you tbh) keyboard for the device that has a battery which actually boosts the battery life of the device. I think it adds like 3 hours or something? It seems like another very capable device. The built in SuperNote application by Asus seems like a very nice addition as well.
Honestly it just comes down to what specifics you want. If you want media consumption, the Ipad is going to be your best bet. They are the first ones to come out with the best apps. But at the same time you are limited by Apple (no additional removable storage, lack of output ports, etc). The android tablets have a closer feel of an actual computer, but then you have variety. Keep an eye on what is coming out, because with windows 8 we are going to see more hybridization of a notebook computer and a tablet. You can already see it with some upcoming Samsung devices and the Sony Vaoi Duo (looks pretty awesome as well!).
But when would you be starting? I am assuming late July? If that's the case I would probably hold off until you get closer just to see what might come out between then and now.