Yeah, that Stryker can turn on you, quick! And you need at least a Dx6i to fly it. Maybe a Dx5e could do it, but not very well. (Assuming you have a 5e from the Apprentice RTF?) I wouldn't recommend it for a 2nd plane, especially if he hasn't mastered all aspects of flying.
I've read plenty of people having trouble with the micro Corsair. I would assume there's a risk of a challenge coming with that one for an experienced RC'er.
I would agree with the T-28 being the best choice of the bunch, perhaps the P-51 isn't far behind, but keep in mind, I've only flown someone's micro T-28 once, and never even seen that P-51. I'd look for the opinions of those who've flown both.