plus variations on these methos... the AR Max method you no longer need a USB drive... you can use Exploit sender...
I suggest going with the AR MAX.... it is somthing that you will use anyways... the HD Loader disc is not needed if you download a newer version of HD Loader..... Plus what are you wanting to put on the HDD..... games.. or homebrew...
40GB is enough for the homebrew... but you would need much more for games... plus a large HDD is cheaper than the sony drive... 200GB about $100.... www.pricewatch.com
PS3 Slim 320GB
PS2 v11 exploit w/300GB Maxtor
PS2 v10 exploit w/80GB Samsung - Network Games
PS2 v10 exploit w/60GB Samsung - Network Games
PSP 1001 3.52M33 w/10GB total storage
NDS DSReal 4GB