Alternator recommendations? (and other very noob question)

Excess is better than not enough.
not on our cars stock wiring. Excess will lead to a meltdown of the stock wiring if the added loads are not isolated from the stock wiring. Our cars original alternators were 30ish amp, some 60ish but with some wiring mods (think Police / Taxi)

But I get your point... your home wiring has a 20 amp circuit to run a 60W light bulb.