Hello Suffolk
I have been using the 950/770 combo with Rockets 850 for 4 months now. I had the 750's before and they were an excellent speaker as well, however the 850s are a big league speaker, more detailed, soundstage etc. I had a Marantz receiver before and had several recordings that I thought were very flat and dead sounding. The 770 breathes new life into these albums and makes them sound incredible like night and day difference.
I highly recommend the 770, great value-it really makes the 850's come alive! They sound better the louder you play them-I have had it cranked to 0dB with no problem- of course the gobs of CLEAN power really helps.
Hope that helps
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Outlaw 990 Pre/Pro
770 Amp
LFM-1 Sub
Onix Rockets 850 Mains
RSC 200 Centre
RS 300 Surrounds
RK 250 Rears
Marantz DV 9500 DVD
Panasonic BD-55 Blu Ray Player
JVC RS 20 Projector
106" DaLite HP Screen
Outlaw Interconnects
Blue Jeans Cables