Next time, go to a book store.
Not only will you see magazines that actually get rack time, but you can pick up an issue of each magazine to make sure your stuff "fits".
If it's science fiction you're trying to get published, the three that leap to mind immediately are Asimov's, Analog, and Fantasy & Science Fiction. The latter does publish fantasy as well, but according to Gordon Van Gelder, the editor last time I looked, they get way more fantasy submissions than sci-fi and are always looking for more sci-fi stories.
A google search on
science fiction magazine turned up all three in the first four positions on the search. What on earth did you use for your search criteria?