Good entry level cables

14 gauge stranded twisted pair that is cut to size, with no coiled up slack, will perform as well as anything in runs of 10 meters or less.

I switched to the Monoprice 12 awg OFC PVC coated CL-2 wire last winter. Available in 2 or 4 conductor. It sounds wonderful in my system.....as good as any of several I’ve tried over the last 30 years, and is very affordable. No marketing BS, just good wire.

I have moved over to using ZU audio cables throughout my system. You can get ZU Mission Mk1 cables through their eBay store for a great price. It’s worth contacting them directly and perhaps they will let you bypass the auction process. The Zu cables are well built. Sound is going to be subjective but that aside they have a robust look/feel and are well worth the price on those qualities alone. 

@obtuse2 It’s amazing how many people have recommended non in-wall certified cables when you’ve mentioned it multiple times. Don’t do that, if you have a fire, your insurance will not pay. 
I agree with @leemaze and @djones51 above.  Belden 5T00UP is a great value. 10 AWG vs most others that are 12 or 14 inwall. For your main speakers at that distance, you really want 10AWG.  If you don’t love the aesthetic of the bare cable, you can do what I did and add braid from the wall out to cover them. It’s very easy To do.  I bought the 250 feet for $240 at Parts-Express for my LCR channels. That left me plenty extra since mine was a through ceiling retrofit and I didn’t know if there would be any challenges. 
I think you are underestimating the distance you really need. You need some at each end To reach the equipment, plus up/across/down. So to me, you need 50 feet each. 5 to the wall, 10 up, 20 across, 10 down, 5 out. That gives you a little wiggle room. 
I have the same Lexicon RV-9 as you, driving Revel 228Be fronts using the Belden cable. It works superbly. I nearly bought the Kimber inwall, and don’t regret it at all. And the cost savings was quite significant. 
I see you chose the Revel 763Ls. I run the 763s at my Atmos F/R, and have been very happy with them running off an Emotiva A-500. I couldn’t pass it up as I got a factory renewed one, plus a military discount. I don’t remember that Lexicon being available when I bought, or I might have gotten that for aesthetic reasons. Although I don’t really like the connectors on the back. 
I used Belden 5000UP for the rest of the speakers. It’s the 12AWG version of the one listed above. Don’t forget you also need cables for your subs, so hopefully you’ve already planned their location, unless you are going wireless. 

@obtuse2 
Lol “over budget”?  I bet many/most audiophiles have had this experience, for some maybe a way of life, others throw their budget out the window.
From my (messy) notes:

Interconnects Max length:200pF/m (inexpensive cable) 7ft 28-40pF/m 30-40ft

Speaker cable max length 8 meters

Better longer interconnects and shorter speaker cables 

Digital interconnects- maybe 1.5m minimum to stop reflections 

Cable importance order:

1. Power
2. Speaker
3. Interconnect 

run digital as far as possible, then run balanced as far as possible, then use monoblock amps set as close to the speaker as possible and do not worry about the brand of the wire

speaker cables should be short 

Iconoclast order of importance:

1st speaker

2nd analog - XLR 

3rd analog - RCA 

4th digital