I have a solution that would give you LOTS of high quality, good-sounding power to your Ushers and solve your crap-cable problem (your current cables will sabotage your upgrades and quest for higher resolution) and stay within your budget.
For the amp, get a pair of
Musical Fidelity Mono 550K power amps. These were released at $5K/pair, but Audio Advisor (and I assume, other vendors) are closing them out at half price. That's 550watts per amp for $2500.
These have garnered many rave reviews and are said to be extremely neutral. They can accept either line level or speaker level inputs. Using the speaker level inputs, they retain the characteristics of the amp feeding them.
Secondly, you need to lose the zip cord. There are a couple of good speaker cable and interconnect deals I know of. One
source is
HCM Audio, who has AudioQuest GBC speaker cable at about $80/8-foot pair and good interconnects to go with them.
The other source is an eBay store called
homenetworksupply. He has the Belkin PureAV Silver series cables at pretty low prices.
Belkin PureAV Silver Series is made of Ohno Continuous Cast monocrystal copper. This is usually pretty expensive, but he has the 4-ft. interconnects for about $18/pair and 8-foot speaker cable with very nice banana terminations for about $65/pair.
I managed to scoop up some 12-foot pairs of these speaker cables from parts-express.com for the ridiculously low $20/pair, down from $130/pair list. Unfortunately they are all gone now, but I have them on my hi-rez 2-channel (primarily analog) rig and they are REALLY good.
So there you have it--550 wpc from Musical Fidelity for $2500 and interconnects and speaker cables made of monocrystal copper for under $100.
As for Bluejeans cable, I haven't used that brand, but I've used interconects made from Canare star-quad, which is the wire stock they use to make their interconnects. I found them to be smooth and musical, but anybody who thinks they're hi-rez is kidding themselves. Those $18 Belkin PureAV Silver interconnects will eat them for lunch, as will just about any interconnect I have in my systems--AudioQuest Black Mamba and Blue Racer (exclusive from Audio Advisor), JPS SuperConductor, and Kimber Hero.
That is the LEAST you should be using with your Ushers.