I would strongly recommend using a small Polycom device with Skype. The Polycom CX100 Speakerphone has an echo cancelling feature that is very effective and the sound quality is exceptional.
You can use this device with Skype during standup meetings with people present in the room and remote staff can use a headset. This is the best way I know to maximize sound quality and minimize echo on a small budget.
Update:
Our company is also using the Polycom CX5000 in some of our conference rooms and this would make an ideal tool for stand-up meetings. The 360-degree camera is automatically following the person who is talking.