I've had very good luck with Sun Race 7-speed freewheels in both 13-28 and 13-30. There are currently three in the fleet, one over 5 years old with many, many miles on it.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)