If you are looking for the very best, consider the Mushkin Redline or Blackline series. They will out both of the memory kits you linked.
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2%2050001504%2040000147%201052129233%201052345114&name=6GB%20%283%20x%202GB%29&SpeTabStoreType=1
Most breakers found inside residential homes are 120V and can do 15 amps. Your power computer + additional whatever else is plugged into that circuit, is pulling more than the breaker is rated for.
You have a few options:
1) reduce the number of appliances pulling electricity from that...
Not necessarily true. Higher voltage increases electromigration affects on the copper interconnect of the processor's circuitry and will eventually lead to premature failure.
What are you system specs? How fast have you been able to get your RAM to run? That seems to be the biggest limitation reported in all the online reviews, but those reviews were with very early BIOS.
what are you planning on doing with the system? and how long do you want to keep it?
The P55 chipset uses less power than the X58 chipset. If you only plan on 1 graphics card, then the choice seems easy.