Not to start an argument, but my experience tells me you can't spot which is which unless you know in advance. Either will work just fine.
I feed component to my AVR, then convert it to HDMI to the plasma. I use the actual HDMI to feed the small slave set in the nearby kitchen.
Both look great; yours will too.
Oh, and I do agree about buying less expensive cables. I suggest you shop at monoprice.com if you are looking.
I am thinking off getting HDMI cable, is there a major difference with the pq?
Probably not. Like the others have said, there is very little difference to begin with, and the smaller the screen, the less likely you will be to notice it. Keep in mind too that component cables can carry the signal farther without degradation. About 20 ft. for HDMI compared to about 200 ft. for component.