Martin certainly sounds like a very exciting prospect, I have to admit that when we signed him I thought he'd be another Molyneux/Pulis character, hyped up and then spend the rest of his Saints career in the reserves, but he's come into the team and done fantastically well in the two games he's played in. With Jaidi getting on a bit and Seabourne not 100% there yet, Martin could well see himself as first choice CB with Fonte next season.
OC sounds good as well, but he should be loaned out to a team in this division next season imo, he needs to get some valuable game time under his belt, and to do it at this level would mean a steeper learning curve but a better one. Same with McNish and Gobern.