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how low can I go without it being sloppy
Depends a bit on the rim width, but @umop3pisdn 's starting suggestion sounds reasonable, and on the right rims you could probably go down to 35f/42r without any trouble. The best answer is to try it and see what you like, as personal preference is part of the equation.
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Try this calculator should give you some idea.
Something like 35 psi looks good depending on your weight etc.
http://www.biketinker.com/wp-content/uploads/2011/04/Tire-Pressure-salvaged-doc.xlsx
Looking for suggestions on tyre pressure for my commuter/work bike. Surly Straggler on 700x45c semi-slicks.
been riding 60 just now but they're pretty hard. how low can I go without it being sloppy...