m.lo2 Ching, if you don't want to spend too much at the begining, you could get a cheaper PC, once you feel like you need more, you can use this PC to sub, bdp or even TV, lot of way to mix and match and that is fun.
As a AV newbie myself, I found I spend too much money for something I don't really like, spend too much money on something in the middle, they are good but not good enough. That's why I said go for a good PC, cause soon enough you will want to upgrade you amp, sub, bdp and TV etc etc. Of cause someone told me I should only spend X% on PC, nobody is wrong, just different way to have fun.
One more thing, do not I mean do not spend too much time in here, cause more time you spend in here more money you will have to spend hehehe...........
Denon 4308
Panasonic TH-P50VT30H
Sony PS3
Oppo 95
Pioneer BDP-05FD
Mirage Omni 150, Omni C-15, Prestige
Energy S8.3
Sound Master 18.3 + WLM Diva