I agree with LSBRX for taxable bond funds. For muni funds, I like ORNAX, HICOX, NHMCX. I own alot of all of them.
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I think it will be LSBRX (it includes preferred stock, which is considered as fixed income, similar to bond)PRPFX is a good balance of FAIRX, but it is a balanced fund instead of bond fund.