All the current blue SMPs are weak....your best bet is to go with WBK (21j model).
If your looking to frankenstein than grab yourself some form of 2824 off used rep sales...thats what I do and there lots of "previously loved" watches ready for modding...
Full blown franken Swiss ETA2824 (mainly gen components)
Franken Swiss ETA2824 (mix of rep and gen components)
Full blown franken Swiss ETA2824
Swiss ETA2824 with gen insert and crown
A21j - modded pearl insert (this is what you get from WBK - without the mod)
Swiss ETA2836 (mix of rep and gen components) *I'm gutting all this and going all gen "Great White" currently...this one needs some serious work...