I own a pair of Infinity Kappa 9's that I am trying to find power for.
Owners Manual Specs:
Nominal Impedance: 4 to 6 ohm (recommends amps that can go lower)
Power Rating: 60-340 watts RMS
Efficiency: 102 dB SPL @1 watt, 1 meter
Crossover Frequencies: 80Hz, 800Hz, 4500Hz
Frequency Response: 29Hz-45kHz +/-3dB
Physical specs:
1x - SEMIT Supertweeter
1x - EMIT Tweeter
1x - 3" Edgewound Voice Coil Polydome Midrange Driver
1x - 5" Polypropylene/graphite Diaphram Polygraph
2x - 12" Cast Frame , L/C Tuned Woofers
These speakers are 5ft tall and require lots of power. In the manual it says that each speaker can be bi-amped and recommends giving the most power to the woofers.

I'm looking for people who have experience powering heavy duty speakers to recommend a budget (I will be shopping ebay, craigslist, and sites like overstock.com) solution for the power needs of these speakers. Any thoughts, experiences, or words of wisdom would be much appreciated
Thanks