Should I trade-up from my Krell KAV 300?


My system is a Krell KAV 300, Meridian G08, and Thiel 2.3 speakers. My interconnects are Creative Cable (Music Direct used to sell them for $375). My speaker cables are Synergistic Research (about) $500. My room is small and I listen at relatively low levels, mostly classical piano, some symphonies.
Should I invest in a used Krell KAV 400 or instead invest in better interconnects or speaker cables?
Thanks for your help.
runfast
IMO you should consider Krell S-300i instead of 400xi, esp with Thiels. S-300i has more resolution, more texture, and is significantly warmer sounding.
Thanks Elberoth2. I never considered the S-300i simply because it was less powerful than the 400xi. I assumed that they'd be about the same in resolution, texture, etc., but I never thought about. Appreciate your advice.
On paper, 400xi may look more attractive, I agree. But if you put them side by side - S-300i is much bigger, much heavier, the power transformer itself is bigger in size. I wouldn't be surprised if the S-300i turned out to be the one with greater current capabilities. Not to mention it is much more advanced in terms of features.
Thank you. What you say makes sense. I appreciate your pointing me in a better direction.