Lots of Spanish guns out there for around that price mark, you'd have to check the individual spec though.
None that I can think of you should particularly avoid, the main thing with any gun is that it fits you and is fit for purpose,
Check for pitting in the barrels and chambers if its an older gun, make sure the barrels are tight against the breach face and the top lever is still springy,
Other than that, just what you'd look for in a normal gun,
Many people will tell you buy an over and under and be done with it but a good fitting side by side I find are usually lighter to c