First, be clear that coaching is not must for Civil Services Examination preparation. If you wish to join any coaching, you should first prepare yourself so that you can take full advantage of what you will be taught in coaching institute.
Delhi is certainly the hub as lots of reputed coaching institutes attract thousands of candidates like you for Civil Services Examination preparation.
If you can afford, you can come to Delhi; there are many good institutes and you can choose these after personally visiting and interacting with candidates preparing in these institutes.
Don’t make concession the basis of joining any coaching institute; let quality of coaching be the sole deciding factor for your institute’s selection.
Put Classic IAS Academy in your consideration list and take an informed decision.