First, keep your CJ for a long time. The 2250A is a sleeper of an amp. As you upgrade the rest of your system the amp will deliver more and better sound. It really needs a good front end for you to get the maximum out of it. Enough said on that.
I have tried several speaker cables with the CJ 2250A and 2500A. While everything is system dependent, the Analysis Plus products consistently performed the best. The Oval 9s are as low as you want to go on the food chain and delivered clear, detailed music. You could live with these for a long time. However, moving to the Solo Crystal 8 you gain degrees more in dynamics, speed, accuracy, specificity and music. Using the 2500A, commpared to the new Big Silver, the 8s are a hair cleaner, maybe not as quiet. The AU 24, one of my favorite wires for its neutrality, sounded a little "sharp" compared to the 8s, but gave up none of the dynamics or specificity. The AU 24 are amazing with Blue Circle amps and the Channel Island DM mono blocks. Neither of the Nordost wires tried (Red Dawn and Valkyrja) improved the sound over the A+ Solo Crystal 8s with the CJ amps. They seemed flatter (no pun intendend) and not as crisp. Detail was there but there was an ever so slight veiling effect, they almost sounded out of phase.
So, IMO, with these 2 CJ amps, you just get more from the A+ Solo Crystal 8's.