umm, you probably can get away with a run of 8ga to the smaller 4ch amp, if you know an electrician, just get a runs of 6ga for them. the 4/150, id go with 4ga minimum, and for the 1k watt pdx, id say 1/0 would be proper.
Lightning audio actually makes nuts power wire. 47XX strand count on 1/0 fits into 2-3/0 fittings only for me..
knu makes decent wire, knukoncepts.com i believe, but the knu stuff is deffinently like 80% of the size of the Lightning audio shit..