Audio Research, next upgrade?


I have been upgrading recently and have had great fun and results. I really like the Audio Research line and I am slowly working my way to the Reference products. I would like to hear what everyone would suggest as the next piece to upgrade, ie CD, Pre, or Amp first. My current system is:
ARC CD3 MKII
ARC LS 26
ARC VT100 MKII
B&W 801
The system sounds great as -is, but always looking for the next improvement.
Thank you
vdosc
It looks like a nicely balanced system. Enjoy it. If you feel like spending money, I'd suggest trying a vinyl setup.
Just a thought. Your CDP is a bit dated. I suggest trying to pick up either a CD-5 or Ref CD-8. The rest of your gear is pretty balanced. In truth, there's no end to upgrade fever.
One other thought. If ARC still upgrades the VT100 MkII to the MkIII, you may want to price it out and consider doing it. Give Cal at ARC a call. He always has good advice to share. BTW, another upgrade is changing out your 6550C tubes to the new KT 120s. You'll be pleasantly surprised by the overall improvement.