They don't make HDD's with 16mb cache until at least 160GB. They are only a few bucks more so I would get one. Yes all of your choices are very recommended.
Its your Australia friend by the way. Your koala is in the mail...
I actually found out from my father I have an aunt in the US. This is handy because I contacted Newgg and they will only ship to a residential address within America. I just hope it isnt that expensive for her to ship the parts out to me. Thanks for your help, greatly appreciated.