Given that I'd need the far side of 100GB to tote around everything, then if I'm going to have to be selective, and I am, it's just a matter of degree. The actual numbers become a bit irrelevant.
And, really, I only fill up my phone with music anyhoo. I have a "most recent n gigabytes" smart playlist in iTunes, and that's the one that gets synced to the phone.
I'm also seriously interested in the fact that these phones will come with Nokia Maps, which has a very good reputation as a turn-by-turn navigation application.