what do I upgrade?

Dedicated circuits: if you had done this to begin with your upgrades would have been more enjoyable along the way, AND PROBABLY NOT HAVE SPENT SO MUCH - BASICS FIRST!!

I spoke with several electrician and don't think dedicated circuits will help since I live in brand new home in a newly developed area. Is this true? Also, what power conditioner should I be looking into?

Allen, as a general rule electricians are not electrical engineers and therefore, no not what they speak when it comes to benefits of electrical tweaks.

Everybody has dirty AC and therefore everybody can benefit from properly treated AC, every digital source injects noise back into the wall for other components to pick up, and most any amp requiring a decent amount of current draw will benefit from a dedicated ciruit/line even at lower listening volume levels.

The only advice I would suggest following from your electrician is when it comes to safety as some to many do know about that.

-IMO

If this is my setup, I would
look into high current Jeff Rowland amps.
The Wilson speakers do suck a lot of juice.
Definitely a super size power cord will help too.
I would get a nice tube preamp.

Your electrician aint no audiophool. New has nothing to do with it. Seperate lines for analog and digital unencumbered by any other household electric. That is the deal. Then power conditioning and power cords. You're there. Electric Nirvana