Ok, so I'm trying for a Halfling Dragon Shaman, and my other set didn't give me an ability over 14 so here are some rerolls.

Spoiler
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Set 2
(4d6)[5][6][4][2](17)
(4d6)[1][1][6][4](12)
(4d6)[3][6][3][5](17)
(4d6)[3][6][6][3](18)
(4d6)[1][5][3][6](15)
(4d6)[3][2][3][1](9)

Set 3
(4d6)[3][2][5][2](12)
(4d6)[4][1][3][2](10)
(4d6)[1][4][5][4](14)
(4d6)[5][3][2][5](15)
(4d6)[5][3][3][2](13)
(4d6)[6][2][1][6](15)

rerolling ones - (10d6)[3][4][3][4][5][5][4][6][1][1](36)


There's one feat not in core that I'd like, Shape Breath from Draconomicon.