I'm curious about what you dont like about the P2 system, yeah a 64 GB card is around a grand but its reusable multiple times, hot swapable, solid state, nearly indestructable, and comes in sizes of 8, 16, 32, and 64 gb... I have been on several several multiday shoots with both an hvx200 and hpx170 cameras and to be honest with you, shooting at 720pn (24fps) i could let the camera roll for something close to 4 hrs (with 2 64gb cards), the battery would die before both cards are filled. fact i made do for a long time with a 32 and two 16gb cards; even used 3 32gb cards and 3 16gb cards for a two camera shoot of a 4 day (all day) conference. off loading & backing up a 32gb card takes less time than to fill a 16gb card, but thats what a tech is for.
either one of those cameras can be had NEW for 3200-3600 at BH, a couple of cards and some sound gear will probably cost you around 5500-6000. then you have to add a tripod.... 5000 bucks aint much
in all seriousness i'd suggest to rent big (alexa, f3, red one) or buy small like a used hvx (they get them at BH at times for around 2500)....