Hi all - this site is so helpful

I have had the Fm Recorder v2 for about 18 months
I have had battery issues (replaced with a 2800mAh-New Technology Battery)
But...I have the dreaded Hitachi 20GB Hard drive which locks while out and about
Question?

Should I replace the old HD with a Fujitsu 80Gb as suggested on another post?
If so , which model number?
Does it matter what buffer size the Hard Drive has?
and the spin speed?
I love my Archos(sometimes!) especially when it behaves itself !

Any ideas, suggestions would be most appreciated