Well, Moser, you had to go and do this to another member, eh!
Anyway - Selvakumar, if you are thinking about going the PC way, do remember that there only two ways you can deliver sound to your speakers. Either by using powered speakers (such as Audioengine A5 or A2) or by using an external amplifier - such as an AVR.
Regardless of which option you take, remember that the PC is, in essence your CD player or DVD player. So, a quality sound card or a quality DAC is a must. And AVRs being AVRs, it is best that you invest in a good quality sound card at around 10K and then connect the analog outs from the PC sound card to the analog inputs of your AVR. That way you are getting the sound card to do the digital to analog conversion. Based on my experience if you are working with AVRs of value less than Rs. 50000, this connection pattern (analog outs to AVR) will be far superior than just passing audio through SPDIF (Coaxial).
In essence it is pointless to use just the Coaxial output from the PC even after investing in a quality sound card. This is, of course, specifically for music. There are sound cards where you can have two connections made in parallel - digital and analog and switch between the connections using the software driver.
A few sound card options for you are - ESI Juli, Azuntech Prelude and ASUS Xonar Essence/D2X.
Do note that you will not need an AVR if you have a powered speaker (a speaker which has an amplifier inbuilt). However you should also consider that such powered speakers will not be able to recognize signals encoded in, say, DTS or Dolby Digital etc. Those fall under the premise of the AVRs. Again considering your 85% preference for music, I dont think this should stop you from considering powered speakers - sans any AVR. You might even be able to work out a very ecnomical, yet powerful solution this way.
Lastly many studio monitors are built for near field listening. You must audition the Audioengine or similar speakers to see if you get room filling sound and imaging even if you sit a few feet away from the equipment. Maybe the Audioengine owners in this forum can fill us all in regarding this.