absolutely, unequivocally, go with the pioneer. If you get the premier version (don't know if thats the 7700 or not) you'll get better pre-out voltage and a 2 year warranty instead of a 1 year warranty.
i know about the premier---and my friend has that pioneer--but the website i found it on has it for 200 instead of 300 but does not sell the premier, so i gotta go with the money. and on car domain for 220 i can get the wiring harness and everything else i need included. the real reason i asked is because the friend that has it doesnt want me to get one like his and i like the look of the sony but i know they dont make good subs so i decided i should ask about the head units before making a choice.