beginner silly qustion about sound card

[bournurplusher]

i want to build new system.i dont much about system hardwares.my prefere
motherboard-GA P55A UD4P.its support 7.1 high definition audio & dolby home theater.i can view lot of configuration and finally motherboard.but i can view sound card in all configuration list.
my qusition
1-all motherboard have build-in audio card?
2-if every motherboard have basic(like2.1) audio card,how 2 change sound card5.1?
3-plz quide me 2 get best 5.1 or 7.1 sound card(my speaker preference-logitech z-5500 5.1 THX certified)
4-if i get logitech 5.1 speaker,plz suggest 5.1 or 7.1 bvest option
5-suppose,i can buy 7.1 audio card(for future proof),logitech 5.1 speaker gives best result or not?
6-i want 2 listen my FLAC formate 24/96 music collection via pc.plz suggest best audio card & pc configuration

[Cool Buddy]

If you want a complete guide on components to buy, post in the PC buying guide section with your budget and requirements. Also mention the budget for speakers.

Now to your question, Almost all motherboards support 7.1 channel sound these days and the quality also is not bad. I would advise you to buy a sound card only if you are spending more than 10-12k on the speakers. Anything priced lower hardly gives the quality to use it with a sound card.
To get the right replies go to the PC buying advice section and post there. Don't forget to copy this questionnaire to your thread and fill in the answers.