should I upgrade my amp

My system contains Spica TC-50 speakers, Velodyne F series servo subwoofer, sony scd ce775 player, Adcom gfp 710 preamp and Adcom 545 mkII amp. Should I upgrade by replacing the amp with the Musical Fidelity Acr3 amp which can be bought for around a grand? Should I not even consider this unless I also change my pre-amp?

Thanks in advance for the advice