1. I'd assume so. Both deals show up on the edu store (Purdue, in my case).
2. Yes. Or you can add in another remote for $26.
3. It's harder to upgrade on your own (i.e., to get up to 1 GB you'll need to replace the 2 x 256 sticks with two 512 MB sticks instead of just adding another 512 MB stick).
Hmmm... An edu iMac + 160 GB HDD + 1 GB RAM + remote still costs $100 less than the standard iMac with 512 MB of RAM (even at EDU pricing); all you lose is DVD burning ($20 external burners are much better than Apple's anyhow) and Bluetooth. Sounds like a deal to me.