X2.x series of chips are great. I've got an old X2.0 in my first box, and a 2.3 in another, and nowadays all I install is X2.6's (unless someone want's something more "robust."
But, beyond that, a 15 USD cheapo chip will allow a HD swap as easily as the X2.6 (though I highly
recommend the X2.6; it's just an example).
You're best friend for upgrading your new HDD will be Slayer's Evox Auto-Installer
2.6 (no relation to the version of the Xecuter chip). It's a bootable disc that will format your drive, install Evox dash and the MS Dash (and a shitload of other apps if you tell it to).
A fire-and-forget solution. Works well on a DVD, but fits on a CD. Edit:
Oh, and if by apples you mean you have a Mac, that's cool. The Slayers disc comes in a windows self-extracting executable file, but you can get around that with some trickery