It is always good to go to a specialist store because then at least you know that 'they' know, even if you don't.
The end result of any musical instrument purchase consists of 3 things which can either disappoint or satisfy:
1. Quality of materials
2. Playability
3. Sound quality
Out of the 3 things 2 aspects, namely sound quality and easy playability need experts who use special tools that average music stores are unlikely to have in their workshop (if the have a workshop which is unlikely). It is even more unlikely that general music stores can use such expert tools.
The quality of sound does not only depend on the quality of the instrument, it also depends on the setting up, and lots can be said about what a good set up involves. In fact, in 2009 there was an international violinmaker's conference in Canberra, and the main topic for this conference, with lecturers coming from all over the globe, was 'the setting up of stringed instuments.' It is one thing to make string instruments. It's another thing to set them up.
The article has been updated successfully.