Go with the closest reputable vendor near you .  If it fails , it is closer to return and can generally be handled in a day . 
       GW or AA , are both great sources and I had GW do mine because I could drive there and back on under a day . 
Plus the fact it was built in house was nice as well . I was able to bring mine with me and have it inspected before I left and settle all core charges without having to ship it or wonder what was really up . 
        There are always local rebuilders who are not "famous" who every bit as qualified ,you just have to look around . 

-Stacy