Is Good HDMI Really Worth The $$$ ?

[Kimosaabee]

So i've looked around for a thread for this but couldn't seem to find anything. sorry if it's been addressed before.

Ok, so i was at best buy and the "overly smart" employee told me that the monster $100 dollar 4 ft HDMI cable would make a world of difference comparing to a say $20-$40 dollar HDMI cable. I am wondering if anyone has been able to experience this making that much of a difference. I think i have a 9' HDMI from walmart that was around $30... it may be rca brand, or phillips. Should i get a better one?

Also, should i go from the blu ray player straight to the tv? will this give a better signal? i have it going to receiver then to tv... via all HDMI... i would think if i had one GOOD HDMI cable going to the receiver i would also need the same quality cable going from the receiver to the tv.... right? is there any benefit in sending the video signal through the receiver rather than just straight to the tv?

Thanks for your help!