As you can probably imagine, a UPS for that level power rating will be costly. If you want the best possible device, I recommend a commercial grade server UPS. They will have extremely well filtered power, as well as large power capacity. You can get some really good deals on refurbed units:
https://www.refurbups.com/proddesc.asp?ProductID=52&prodrecommend1=105&prodrecommend2=110&prodrecommend3=40
If you want the absolute 'best' quality power, look for the ones that always provide power from the battery; basicly they always regenerate the power instead of only doing so when the UPS is on emergency backup mode. But these, of course, cost more...
As for connections, just hook the stuff into the UPS directly. Use seperate high quality surge protectors/filters for the phone lines/cable/etc. if needed. Check to be sure the one you get, if any, have fans that may cause audible issues.
-Chris