Noob looking for some PC cinema audio ?

used the poor sound quality of my plasma t.v. for 2 years now but I'm building a new PC and moving to a new home. What would be a good start ? I'm not willing to go for surround sound till 2 years or so (when we will finishe the basement) so for now I,m just looking for a some PC sound card that I could use with 2 speakers when we're going to listen blue-ray movies. If a cheap solution exist that I could convert into surround later on it might be interesting.

What would you guys suggest for a begginer ?