If you wish to stay away from fuzz - seriously consider stacking.
Get your favorite drive pedal... find a booster. Then goose it.
Some boosters that are great for sustain but wouldn't turn your tone into fuzz - consider the... *sigh*... tubescreamer variants. On their own - lots of compression and stuff already, so you can imagine stacking with them.
That said, if you don't need THAT much gain - go to the buy/sell, the3rdlogic is selling a good ts-type pedal, the Zeek overdrive. Its got more gain than a TS but.. well... sounds better. Singing sustain and all.