welcome to the site. let me first off tell you that you posted this in the wrong section, lol.
but i have done this project with OEM parts and everythign (including microphone/sterring controls) can be bought for under $500 from
www.hondaautomotiveparts.com
some people have done it with running new wires for just what is needed but im not THAT electronically inclined, so i chose the more labor intesive way and removed the entire dash harness and replaced it with teh navi dash harness. took an ENTIRE day and alot of small cuts on my hand from metal inside the dash.
let me find you a link of all the items i used....
http://www.8thcivic.com/forums/showthread.php?t=43805
post 56 and 57 should help.