Bluetooth is useful if you have a mobile phone that speaks BT and that you want to sync with. Also, Internet access using your phone and BT can be handy while you're on the road. Another application is using a BT headset, especially for VoIP. If you don't use any of those, you probably don't have much use for BT, however.
As for the HD, I would recommend the biggest one you can/want to afford. Replacing it later is difficult and pricey, and you really can't have too much space - especially if you plan on having that PB for several years.
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