Foles would be a good acquisition. A young guy with talent and knowledge of the scheme. Issue is, the Eagles say they won't trade him without a significant offer - so he won't come cheap.
A cheaper alternative (in trade terms) could be Brandon Weeden. The new regime in Cleveland doesn't seem too keen on him, so he might be obtainable for as low as a 4th or 5th rounder. I'd do that, plus draft a guy in the 2nd or 3rd, if guys like Foles or Flynn prove too expensive.