Dorian Yates' credentials aside, I prefer weighted dips. After doing his program for a little while, I also disagree that progression in decline benching returns the same functional, whole-system strength gain that flat bench does. The motion of decline bench is done from a position that is unnatural and limits range of motion considerably.
That's not to say that it's a bad exercise. My experience just tells me differently than Mr. Yates.
tommy - Like you, my chest is the weakest part of my body (by a long, long way). I also train incline every week on my chest day, so I don't think you need to replace that exercise with anything in order to reach your goals. If your incline numbers are going up, you are making progress and becoming stronger.
That all being said, it seems like you're still in the beginning stages of strength-gaining and I don't think you need to worry about lagging muscle groups yet. When you can deadlift/squat 300+ for reps and your bench press still hasn't made any gains...then we'll take a look at what might be going wrong. For now, though, I think the best thing you can do is just keep attacking the routine that you have -- it seems well-balanced.