This is the sole reason I went for the 950/770, so I could upgrade either unit and not be left wanting.

Sure, the 790 will look like a the 990 (my 770 is tucked away...well hidden by my SVS ) and when and if I ever need 300w per channel, or that I can convince my wife at a later date that I need 'cleaner' power, I'll get one (she asked me why I didn't buy the matching amp...*sniffle* window closing...