hi, i posted the original question. thanks for all the advice. for information, i opted for 2 x 500gB LaCie hard drives (one as archive), as these were on offer at a good price! they run warm but are quiet. music quality is to my ears indistiguishable from cd, so i am happy right now.
if technology improves and/or my music collection grows i can always buy a different 1gB hard disc.
if technology improves and/or my music collection grows i can always buy a different 1gB hard disc.