Hate to give a solution to myself here: I got the high quality Deepcool one, with capacitors installed in the power line for the card on the cable itself.
Basically, it works. Its very, very picky though. in order for it to actually work, it sometimes requires reboots of the system because the damn BIOS fails to load. The system also cannot be put to sleep without completely shutting down the graphics output, cannot be restarted without the same happening. What DOES work is full shutdown and power off of the PSU so the capacitors can drain charge. Basically, if you are looking to have a 750 ti (no external power) on a riser cable, don't. its too much of a pain in the ass for what its worth, but hell, it works 50% of the time for me so thats alright