I will buy any kit from Keepsake Quilting, Hancock's of Paducah, Connecting threads, or any of the reputable fabric houses (such as Moda) whose fabric lines please me.
Buying from good rep distributors or designers has always yielded excellent results for me.
Also, while Keepsake's "scrap bags" aren't exactly kits, I've found they are always well-coordinated and turn out great results with a good pattern.