I need to replace the front and rear bumper covers on my '03 Accord EX 4 Door. Does anyone know if lower priced aftermarker bumper covers fit the accord or should i stick with Honda parts?

I'd stick with the Honda parts. Aftermarket body panels from what I've seen don't fit the same way that the OEM parts do. Usually this is seen in bumper sag, crookedness, or uneven bends in the plastic.

Honda body parts can be identified with by tags that say H DOT on them I believe.