Speaker and Cable Suggestions Please

In that size room and if you don’t listen very loud, B&W 805 D2 would be a good fit for what you’re trying to accomplish. They love power though so your ARC integrated is going to work for its money but I think it should be fine.
As far as speaker cables, I can second the suggested on Audience AU24sx above. Used all this may be slightly over $4,000 used but not by much. If you want to do cheaper cables, you can find a used pair of Acoustic Zen Hologram II. 
 

I'd agree with the others -- for near field listening in a small room with a 75 watt/ch amp, the last thing you need to be concerned about is speaker sensitivity. (One exception -- if you are looking for a rock-concert 100+ dB average sound level, in which case you can ignore my comments.)

I have a pair of Spendor 4/5 speakers (under $3K new) in a small room and really enjoy their natural sound and consider them very musical for their small footprint.  However, I can't tell from your original comments concerning mids & highs as to whether you are looking for emphasis in that range or just very natural. BBC type designs are legendary for their presentation in the vocal range, but that's not what everyone is looking for.

Thank you all for your responses. I hope to read more. I may go with good cables first. I was thinking about Hologram II. The Audience AU24sx are out of my budget range, even in the used market. I want to keep speaker cables under $1,000. I was also looking at Avanti Vivace. I find the company's use of separate cables for the positive and negative an interesting concept.

I'm beginning to think I should just get better cables and bid my time, use my Focal Arias, and wait until I can better afford a more appropriate speaker for my room. It's just that my trade-in value for my Arias is never going to better than right now.

I’m beginning to think I should just get better cables and bid my time, use my Focal Arias, and wait until I can better afford a more appropriate speaker for my room. It’s just that my trade-in value for my Arias is never going to better than right now.

I think this is a good move. The Arias are very nice speakers. And I think the Hologram II will be a good match. 

You compromised and bought a 75 watt amp for your low sensitivity speaker.  If you wanted to replace your speakers, you should have done that first, got a 96dB+ speaker and gone SET.  So buy a sensitive speaker so in the future you can.