If you want to stay with a single stage on a budget, I highly recommend the JMT Tactical Saber. Very nice cassettes unit with a pull around 3.5 #'s, minimal creep and includes both set screws and antirotation pins for install am deathly runs $100. It's not on par with the high end Elfs and Geisselles but my example is better then anything I have tried under $200.
