need more power ?

Hi, need advice, running my von schweikert vr3s with forte model 5 100 watts per.The sound is very nice, sweet highs very ture sounding mids with many types of music,problem is the bass.I need a power amp with real power, fast dynamics and transient.Rest of my system audio research ls3 pre amp, msb dac with power base sf transport and straightwire rapsody interconnects and speaker cables.Looking to spend around 2000.00 used.Your suggestions would be appreciated. PS yes I have already tried speaker placement in room. Thanks maxwell