Hi Petrucchio,
Post #2 here should be helpful. There are lots of very good choices there and while all of them aren’t in the San Fernando valley, some are in the valley or within reasonable driving distance.
A forum search on “Los Angeles” (without the quotes) will bring up a list of complete posts which you can scan for more information about various manufacturers that are included in the list or member experiences with some of them. A list of all the threads that include “Los Angeles” (but which only has the first few lines of the first post that includes the search term) can be seen with a site search (the search window at the top of the page).
Good luck … and feel free to post if you have questions along the way.
Phoenix