I have an almost ethnically inclined approach to buying records, which goes something like this:
Mattu enters the store, flicks through the house, broken beat and garage crates. Mattu spots a record with a hispanic name (example: Frankie Feliciano, Bobby D'Ambrosio, Miguel Migs) or an African-ish name (example: Obafunke, Mutabaruka, Femi Kuti) on it. Mattu's interest is sparked, and record is stuck under left arm. And so forth.
I tend to look towards records with either interesting titles or names of producers, preferrably on a latin or afro trip. I have a few a things that I always look for on the labels, such as "Shelter mix", "MAW mix", "Osunlade mix" etcetera, and those records always go with me to the listening post.
There are also a few record labels that I somewhat trust, so I always check that out as well.
But to put it simply:
If you have a b!tchin' track that you want Mattu to listen to, release it under the name Manuel Escondido and have Blaze remix it. Also, the more it sounds like something from the past and/or involves a lot of live instrumentation, the more likely I am to get it.