It shouldn't matter whether you flash from SD or USB. Check out this site. I used to grab builds from here all the time when I used this kitchen. For the most part, they are ready to drop in the kitchen and go.
http://joojoobee666.ppckitchen.org/Kitchens/?C=M;O=A
It's usually kept up to date with the newest released builds.
If you're unsure how to insert them into the kitchen, check out this post by Lat that really helped me out a lot.
http://forum.ppcgeeks.com/showpost.p...postcount=2821