Philadelphia Area Golf Instructors?
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I'm not sure how much help I could be... I would've recommended Mario Bevelaqua but sadly he moved to Vegas. Agreed on John Dunigan... I've never worked with him, but I like what he's about. Also agreed on checking out the list of 5SK instructors. Honestly, I'd go that route first and pick the guy closest to you.
The best instructors I know unfortunately are in Erie, Southern California, and Florida though, so again, I don't think I'd be much help here. I'm actually a bit embarrassed I don't have any good suggestions for the local area other than what Erik said...
If you're planning it for next spring, you have a lot of time to get something together. I think your best bet would be to book a weekend stay in Erie and then seeing Erik and Dave for a clinic. I really can't think of a better way to kick your season off. Then I would supplement with Evolvr throughout the next months.