1) Source - A dedicated laptop would create undesirable fan-noise in the living room. Look into a wireless interface, such as the Logitech Squeezebox or you could use the Airport Express.
2) Amp - There's only 4dB difference between 50w and 120w, which is only important if you want to listen to THX reference levels. With the Totem Hawks, you have 88dB sensitivity. With 50w and 120w, you will be able to reach an SPL of 100dB and 104dB, respectively, listening 8 feet away.
3) Speakers - I have no experience with Totem speakers, but if you're going to skip the bass, you may want to get something with a little more bass extension, depending on what you listen to.
4) Cables - They make no or little difference, in my opinion, especially considering cost/value. Buy the most inexpensive set you would feel comfortable using.
I agree with Jeffjarvis that if you aren't sure what you'll keep yet, buy something with good resell value. It would really help come time to upgrade.
2) Amp - There's only 4dB difference between 50w and 120w, which is only important if you want to listen to THX reference levels. With the Totem Hawks, you have 88dB sensitivity. With 50w and 120w, you will be able to reach an SPL of 100dB and 104dB, respectively, listening 8 feet away.
3) Speakers - I have no experience with Totem speakers, but if you're going to skip the bass, you may want to get something with a little more bass extension, depending on what you listen to.
4) Cables - They make no or little difference, in my opinion, especially considering cost/value. Buy the most inexpensive set you would feel comfortable using.
I agree with Jeffjarvis that if you aren't sure what you'll keep yet, buy something with good resell value. It would really help come time to upgrade.