How difficult is building an op amp circuit with datasheet performance?
Since you are talking OPA the layout given by Texas Instruments is something to treat as an holy scripture, especially with these high performance parts. Starting with a proto board is not exactly the best way.
As for distortion issue be careful on capacitors in the signal path, different technologies have different behaviour. In principle, films are better than ceramic in these circumstances (due to DC bias and piezo effects)
Most probably unless you have a $$$ audio analyzer you will not tell the difference.