In my opinion most clubs in Frisco are overpriced, empty, and week as fuck. There were a few good reccomendations already. Ruby Skye is tight but cover is $20-30 and drinks are expensive. The best clubs in my opinion in the SOMA area are Temple, Roe and I've actually been to a couple pretty good parties at The Room on 6th and Mission when they have good promotors. Cellar is a cheaper, smaller, and pretty easy to do, there's also bars up on Block on Polk so if thing's don't go the way you want them too you can bounce around.
I would reccomend you check out the bar scenes in North Beach or the Mission. You aren't paying a dime most places for cover, the drinks are cheaper, there's a ton of variety in the options available, and they are all in one place so you don't need to strike around the city. Oh yea stay away from those hipster bars in the Mission though.