well, in my very humble opinion

if it works for you, it's good for you. The guy/ girl listening to the system needs to be happy with it. So if a cable change elevates you, great & go for it.
Common sense is only a guideline. Eventually, av is about emotion.
okay, one quick question - for existing tatasky users upgrading to hd- you get a new stb, right? - do you get also get a new subscriber card?.. The reason i ask is, i'm evaluating a move to hd, but i'd want to keep my existing stb to attach to another tv.
The customer care person i spoke to was rather confused, so i did not get a clear response from him. So any feedback would be great
cheers