Stormborn
Explorer
The perfect game is Mayfair Games DC Heroes (3rd Edition). It's out of print BUT its underlying rules are available in the Blood of Heroes RPG.
Don't let the horrendous art throw you off because the game is great... by far my favorite "supers" RPG.
There was even a Watchmen supplement for the DC Heroes game, which works seamlessly with Blood of Heroes. Sadly it is out of print a pricey on Amazon.com.
Noble Knight Games has Blood of Heroes for a reasonable price and all versions of the DC Heroes games at unreasonable prices.
However, I once ran a pretty good Pulp Heroes game with d20 Modern, some Thirlling Tales, GR's Psychic Handbook, and some odds and ends. Powers were all low level but it was pretty fun.