Yeah, the biggest "Problem" with the 753F's is their 6ohm nominal impedance, a lot of amps are rated with 8 ohm loads. I've been using Audiolab amps on them for quite a few years now, as they complement each other, Started with a 60W 8000S, added a 100W 8000P (stereo power amp), and finally replaced that with 2x8000M (125W mono power amp). The mono amp really does deliver, infact it can sustain 200W into 4 ohms with minimal distortion.
When I went from stereo to surround, I replaced my 8000S with a Tag AV32R which is a dolby (and dts) decoder, coupled with a preamp... Basically its a digital decoder combined with a volume control. Monoblocks are simply mono power amps, no volume controls (that handled by the pre/processor). Im using 1 mono amp per speaker (so 5 boxes containing 1 mono amp each). My sub is a really rather rubbish self powered box, but its only there to provide a bit of extra rumble during Sci/fi (starship engines!) movies. The drivers on the speakers are fairly small, and while they do drop to around 35hz, the roar of a starship engine is a bit much for them, so the sub just "assists"
Actually for a while before I had the Tag, I had a Yamaha DSP-E800 (I believe that was the model), which was a surround processor, pre-amplifier, and power amp for the centre and surrounds, but had no amp for the front stereo speakers). I quite enjoyed the performance of that processor, but replaced it with the Tag when I managed to get my hands on a second hand AV32R
BTW, while I've been very happy with my speakers and amps... should the day come when the speakers are simply too old, and mebee worn out!... Monitor Audio speakers would be pretty high on my audition list
