GDaddy, Yes, I had indeed, read some of your posts.............probably where I got the idea from!
I also thought of Seagate 500s.......but Google revealed quite a few 'sudden failures'......could happen to any drive I suppose? You obviously think highly of them.
They are certainly good value....better more than less.....and they would fill all Mac's requirements. I'll have another look at Seagate.......will I mention your name?!! Regards, Joe G.