Do nothing. The TC60s are not the greatest speaker on earth, but they're real good and a tremendous value. You could spend alot of money for a better speaker, but not necessarily get substantially better sound. I'm familiar with the Proac and the AP Virgo -- they are better speakers than the Spica. But who knows whether they will really sound better than the Spicas in your room with your setup. Upgrading is dangerous path and will not always lead to more musical satisfaction. Avoid it if you can.
upgrading from Spica TC60's to ??
I have had the TC60's for a long time, and the TC50's before that. I feel I need to upgrade under the assumption there have been some advancements over the last ten years. Other than that I love my speakers. My electronics are pretty good including a CJ 11A, 70watt amp. I have a small room and am considering a small/medium floor standing speaker. I would like to hear from someone who had these speakers and found something better, not just different.