Not having a shop bought violin myself (its a bit of a one-off

) I maintain the view that the older the better, which obviously isn't a great deal of help here!!
My first violin was a stentor, and it was a fantastic, and quite within budget. The best advice I can give you for buying a violin is go to a specialist shop (i.e. one that sells only string instruments so the people really know what they are talking about) and explain your budget to them. Then just spend some time playing the vilolins and really listen to the sounds. One of them will be obvious to you, I'm sure as they will all differ in timbre.
And for anyone who is interested I also have a Yamaha 'silent violin' and its b-e-a-utiful!
Hope this helps
Bex
ps. A violin has strings of GDAE whereas a viola has strings of CGDA.