I think that 1GB combined storage for email and iDisk would be a good value. But of course, I would accept more if they offered it.
I encourage everyone who wants to see the size limit increased to (nicely) give feedback to Apple on this:
I'm getting about 2Mbps on my cable connection, so I'm pretty happy with it. Up until May of this year however, I was on a slow dial-up connection. I couldn't believe how fast my cable was at first, after being on 56K for all those years!
The only thing that I will probably buy next year will be Tiger. I'm happy with my current computer - a 17" iMac 800. I've had it a little over a year and a half, so it still has quite a bit of life left in it.