I would go for FCP.
Color Correction in Photoshop gives you a different result than in FCP.
Computers displays are also different from video monitors or tv's. Best advice is before grading send the video output to a video monitor or, if you dont have one, a tv.
Then Color Correct your stills with the filters and the Videoscopes.
Rui Barros
Editor Colorist Trainer
Lisbon, Portugal
RTP Post-Production
Apple Certified Trainer FCP 7
Apple Certified Pro FCP 7