Those are probably very low expense ratio = good
with schwab you should have no transaction costs = good
SWPPX and SWLGX are very highly correlated and nearly the same thing.
poking around the other day schwab has a profolio builder that will suggest a set of etfs. for agressive folk it had 50% large cap and 30% international, and 25% us small cap, 5% cash or something like that. you may want to try to find it and see what it sais