To close this thread after a long search I will post the three quality stores that I have found sending my comp internationaly/price/customer satisfaction:
http://EuclidComputers.com (many certifications,international,prolly where I will buy it, notes: 4,5/5, 85% customers will buy again here)
http://PCUniverse.com (international, notes: 4/5 , 79% customers will buy again here)
http://TechOnWeb.com (International, IBM Reseller)
http://TigerDirect.com(International but they force you to call USA.., a lot of reviews, probably not the best one to choose)
Euclid or TechOnWeb will be my choice, but if you are searching like me an USA reseller, I suggest you to use 1 of these 4.
Cheers.