what is the best..

[SPARKS]

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best excercise to help develop the inside chest?

and which is the best for makeing the sholders broader?

 

[Arnold]

This is a very controversisal issue, isolating areas of the pec muscles, some will say you cannot, others will say you can.

I believe you can to an extent, but it's better to just focus on the chest as a whole rather than breaking it down to upper/lower & inner/outer.

If I were to take the side of being able to isolate the "inner pecs" I would say to use dumbbell flyes and a pec dec machine.

 

[Scotty the Body]

i agree with prince, just work on the whole thing, flies, PD and Cable crossovers will help.
As for broad shoulders, standing lateral raise.

 

[Dr. Pain]

The CONTRACTION (think about it)

DP