looking for a new pre/amp or integrated amp

Also, regarding the sound quality using Ethernet vs. WiFi, I suspect it will depend on the configuration of the home and relative distance between the router/modem and the end devices, but in my experience with Bluesound Node2 and in a two story 4000 square feet home, I could hear no difference between the hardwire and over the air.  A slow internet speed will affect both configurations. Needless to say, ymmv.

chrshanl37: I was hoping to just buy one box, but maybe it is not possible.

Unfortunately a one box solution may not exist within your budget.

As mentioned previously your best bet may be going with a home theatre receiver. Granted you won't need all the channels of amplification but they can meet your other requirements. Yamaha RXA3070 fits the bill on just about everything you're looking for: Ethernet, wifi, xlr input, 165 wpc, phono input, $1,999 new, though HT receiver prices tend to be dirt cheap on the used market. As mentioned in your description if you have a bluray/DVD player you have the option of connecting via hdmi. You can program the extra channels to bi-amp speakers or have multiple stereo zones if needed. I used a Yamaha rxa 3030 for stereo when I was inbetween integrated amp purchases for half a year and was really surprised at the sound quality.

I run Ubuntu Linux on a laptop old enough to have a Windows Vista sticker on it.  Every bit as good a media player as anything you can find on Audiogon costing many thousands of dollars.  I run it into a Peachtree DAC, which feeds a standard unbalanced line into an SP13 tube preamp from tubes4hifi.com.  The Peachtree has an optical feed I take from a CD player.  

There's nothing made with all the things you're asking for which will surpass my rig.