I bought some 1/0 ga wire from them (on the evilBay) and it was really good stuff, quick shipping. Their alternators look a little pricey though, still probably cheaper than summit or jegs.
Not too sure about newer Rangers/Explorers, but my 96 OEM alt. was 95 amps. Same year Explorer had an optional 130 amp alt.
I upgraded to a 200A alt a while ago. I believe their evilBay user name was AlterStarts or something like that.