Barney,
This is the same infraction for which you suspended my tour card. Nonethless, I think it's a good question. I interpret "need to see" as courses that capture one's imagination or tickle some fancy.
These popped into my mind:
Fenway - I love that tiny green in Ran's profile, and I'm Tilly deficient.
Dornoch - ever since I read Wind's North to the Links of Dornoch over 30 years ago.
Cruden Bay (maybe with a stop-over at Stonehaven thanks to James Finegan)
Lawsonia
Seminole or Plainfield - I'm enamored with Ross.
Palmetto - To Mackenzie what Mid-Pines is to Ross.
Pacific Dunes - I need to see first-hand just how good Tom Doak is - Quail Crossing isn't a fair barometer, is it?
A course or two in England or Wales recommended by Paul Turner.
Riviera. I've never played a Geo. C. Thomas, Jr. course and need to ease my mind that the man wasn't some kind of knuckle-head based upon my reading Golf Architecture in America .
My "like to see" list is much longer and would be topped by Pine Valley, but there's just no jones there for some reason. Also, let me apologize to our brothers in Australia and Ireland. I started to add Yale, Friars Head and Sebonac but deep down I'd just be pandering.
Mike