8 gauge sufficient for 300W rms total?

I'm building a new system for my friends nissan altima 04. I've heard their alternators are really good for car audio and can handle alot, is this true? Anyway he's going to have 2 amps, 1 powering his fronts which are @ 50W x 2 RMS and 1 powering his sub which is @ 200W x 1 RMS Both of these are @ 14.4v.. So I'm trying to figure out what gauge kit I need to get him by using this chart: http://www.crutchfieldadvisor.com/learningcenter/car/cable_gauge_chart.html If my calculations are correct he only needs 8 gauge wiring.. Is that right? I got around 43.5 amperes with about 13-18ft of power wire. And by looking at that chart it seems thats all he needs.

Definitely go with what KarTuneMan said. I've seen that happen so many times. Even with my first system, I started with 8G. And sure enough, a couple months later had to switch it out for 4G because I added another amp.

^Alright I had that 4gauge in mind too.. I know he'll probably want more power. I did my calculations and if he wanted to up to 600w for the sub itself that will defenitely require 4gauge. Thanks.. :)

Always run 4ga. They shouldnt even make anything less. Why take the chance of burning up a power supply in your amp. If your hungry would you rather suck your food threw a straw or a big spoon untill your full? LOL

^Yeah thats what i did with mine. I've been running 1/0 gauge since I started work on my car.