I did a little research on this when I upgraded my panel during a renovation. I hear the Square D panel with the copper bus bars is a good way to go. I ended up with a Murray panel and had copper bus bars ordered as an upgrade. Make sure your electrician does a good job grounding the whole system and consider mounting an Environmental Potentials waveform correction device to the panel--excellent surge/lightening protection and also eliminates noise and hash in the line.
Good luck.
Good luck.