Am i missing something without a power conditioner?

courant .  My power - station PSE&G is very stable. Very rarely will there even be a black out ,even in most severe storms. My 20 amp line connects to my breaker box. Also you say that there is a slight decrease in sound quality? Someone also said that putting a power conditioner on an amp is like putting a condom on it. 

BTW..  I live in my own house. 

Yes, if your objectives are enhanced system performance, better sound quality and greater enjoyment, etc. 

My question is with these high quality power cords do i still need a power conditioner?

Unfortunately, you ask an open-ended question that is system dependent and the only way to know if you will hear improvement is to try it and judge for yourself.
With that said, depending on which power conditioner you might try, results will vary. I believe that most likely with a power conditioner you will be able to hear more micro details however the percentage of improvement vs the cash outlay for the power conditioner might be marginal. I have four different types of power conditioners that I retate between two different systems and I hear improvement with all of them.

Like others said, you just have to try. I initially started by buying a used Audience AR1p (i think) for a couple of hundred. I plugged it into the wall and plugged my Wiremold power strip into it and I was very pleased with the result. So much so, I ended up with an AR6T that I’ve had since about 2009 with no regrets. I don’t follow the classifieds much, but I have seen AR6s (non-teflon) up at fabulous prices and it’s a first-class item, even without the T-caps. Maybe try one and check it out.  In fact, there is a 6T up for 2k, which is really a good price.  I know it's a lot of money, but cheap power conditioners can really ruin a system.  Good luck.