[halostatue]

If you mean memory as in storage, there are several ways around that for certain classes of data (mostly photos) through the camera connection kit. (I have a HDD photo tank that includes firmware capable of mounting a folder as if it were a camera card, fooling the iPad into mounting data from a hard drive.) On the other hand, with my 32GB iPad (2010), I don't think that I've hit a limit that I care about. (I don't typically care about movies on the iPad, and HandBrake works beautifully to convert DVDs for play on the iPad when I do care.)

For format issues, both AirVideo (http://www.inmethod.com/air-video/index.html) and ZumoCast (http://www.zumocast.com/) provide ways to stream data from your primary computer with 'live' transcoding of the data into formats that iOS devices can play without any additional codecs.

My suggestion is buy the new iPad. Play with it. You'll either realize that your concerns don't exist once you have the device, or they matter more than anything else. If the latter, wipe it and sell it. You'll get great resale value for it, even a year later. If the new iPad is as hard to get as the iPad 2 was when it first came out, you might even manage to break even.