i have a plan to build a htpc by the following parts:

i3
i3 mobo
4gb ram
any 5 series with hdmi port (cheap) recomand?
around 550w psu
2x 1tb hdd
medium casing like cm centurion.

i have a question abt the 5 series gc...any cheap and good gpu that can allow me to play those x264 files smoothly? and if a hdmi port gpu...connect directly to my lcd tv port..will it be able to use my lcd tv speaker?