Here i uploaded some datasheets for radio ic with mechanical tuning (do not need to program a MCU).
http://maximradio.altervista.org/datasheets/
They are from KTmicro, AKC Technology and Silicon Labs.
Some were avaialble only in Chinese and i translated them to english

KT0936M is supposed to be even better than the Si4825;
a discussion can be found on the CQHAM.RU forum, you have to use google translator
http://www.cqham.ru/forum/showthread.php?39304