The upstaters here have mentioned Crag Burn and Seven Oaks several times. Both courses are very solid. Crag Burn is certainly a notch or two above Seven Oaks.
I've played Seven Oaks dozens of times, and while there are a few bland holes, there are several excellent ones. The par threes are all excellent (I've never seen a hole quite like the 2nd or the 14th), and the long par fours are still tough for today's players. The course also has a Golden Age ethos of defending par at the greens rather than off the tee. There are a few tough driving holes (5 from all the way back, 6, 7, 9, 18), but there are no fairway bunkers. The long hitter can get away with a lot if he misses it in the right spot. Yet he will be endlessly befuddled by the greens. This trait makes Seven Oaks refreshingly different from the usual RTJ test.
As for Crag Burn, you will not believe how good it is until you have played it a few times. The overall experience certainly tops the high-priced, overcrowded resort courses at Mauna Kea, Spyglass, etc. Crag Burn also showcases RTJ's overlooked strength => first-rate short fours.
I played Crooked Oaks at Seabrook Island a few times a long time ago. It did have a few interesting holes, but nothing outstanding.
I also pose the following question: to what extent do Robert Trent Jones' most famous redesigns qualify on this list? At Oak Hill, Oakland Hills, and Baltusrol, RTJ (or Rees) are responsible for most of the current bunkering and a few of the current green sites. Can this be labeled as Trent Jones courses?