I agree with others: Option 1 look the best but I would also like to see varying degrees of sizes (small, medium, large, xl). Also would like to see all actions modified to use any breast size.
1 looks best to me, most natural. 2 is how 1 probably would look like in decently (or indecently) supporting garments. Shape-wise I like 5 second, but they should be a bit smaller to look somewhat natural. The nipples appear to be the same on all of them and those i rate at about 8.5