The direct performance jump is big, but not earthshaking. (Yes, I'm well aware I have neither. But when Cortana started to fall to pieces I did alot of research.) On the other hand, the PXA270 in the 3200 can be clocked from 416 to 520 or 624 mhz, for a big speedjump.
Yeah, the hard disk would be quite cool to have. XD
Note also the additional features from the 860 such as USB host, which can be useful for storing movies and stuff on for watching in hotels etc.
It's worth the money if you'll use it. But also remember, Quitting the X desktop and playing in mplayer will also speed it up. XP