My wife says yes Help what to upgrade next?

Gregm was right on. Start with power cords and consider a power conditioner. Something like an Ultimate Outlet with a thirty day return policy from PS Audio might work. Then interconnects and spkr cables can fine tune the foundation you've provided with the pc's.

I would definitely replace the Miles and if necessary add a preamp. There are some good CD players that will work amp-direct in lieu of the Miles but there are also many good choices that are only line level. Either way you will definitely improve the performance of your system by upgrading your CD player. The Miles never was one of my favorite players, and digital has come a long way since that model was released.

Well, I wouldn't be upgrading the wife, for sure.

I used to own a Miles and I liked it a lot. I would also recommend upgrading your power and cables. For interconnects and speaker cables, I recommend trying Harmonic Technology, which I have had good luck with. The last thing I would do is buy a preamp. I also run my CDP directly to my amp and have found that choosing your amp in this configuration is critical. If you get to the point where you are going to buy a preamp, just think of the amp you could upgrade to with that money!

I have used an Aragon 8002 for years and has been extremely happy with it. But, eventhough the 8008 is the more expensive amp, the 8002 is more balanced and musical. What I mean is, the 8008 is boomier in the lows and sharper in the highs.

The BnW 802 can sure benefit from the extra oomph the 8008 provides, but its metal dome tweeter can do without the sharper highs. This is probably why you prefer the Monster Sigma being they are mellower sounding cables.

You probably want to get a new amp and powercord for the amp and especially for the cd player.