Sir
Go for a Oriel, if you can afford, not just because of music system, but because of Alloys, key less entry and passenger and driver side Airbags.
The Factory Head Unit has good sound quality but if you want to get a high end Audio system like Pioneer Reference series or Alpine CDA9887/CDA 117, you have to spent between 25-35K Rs, also have to change the front panel/dash mount of civic to change anything to aftermarket (other then Chinese stuff/Rockmars), you can get the Panel directly from Honda South or Plaza or at Haroon radio.
Alpine Electronics of Asia Pacific Co., Ltd.
Alpine Electronics of Asia Pacific Co., Ltd.
You can also get a good quality Pioneer for 13K Rs.
http://www.pioneer.com.sg/storefront2/ProductDetail/default.asp?ProductId=992&CatId=2,24,33
In other Scenario, you can change the speakers to Alpine type R/type S or Polkaudio Components for front and round 6.5" D series Pioneer or Type R for rear, that can cost you 7-12k rs for front and 6-7k Rs
Alpine Electronics of Asia Pacific Co., Ltd.
Alpine Electronics of Asia Pacific Co., Ltd.
Amplifier is to add some power and clarity to sound, if your listening levels are within car, you will be OK without AMP.
Regards