Yes, you can use HS. If you have pbp 3.x, you can check by looking in the pbp3 directory, under the device reference file.
For the 4550 osc configs, you will find these options:
Code:
; Oscillator Selection bits
; CONFIG FOSC = HSPLL_HS ;HS oscillator, PLL enabled (HSPLL)
; CONFIG FOSC = HS ;HS oscillator (HS)
; CONFIG FOSC = INTOSC_HS ;Internal oscillator, HS oscillator used by USB (INTHS)
; CONFIG FOSC = INTOSC_XT ;Internal oscillator, XT used by USB (INTXT)
; CONFIG FOSC = INTOSC_EC ;Internal oscillator, CLKO function on RA6, EC used by USB (INTCKO)
; CONFIG FOSC = INTOSCIO_EC ;Internal oscillator, port function on RA6, EC used by USB (INTIO)
; CONFIG FOSC = ECPLL_EC ;EC oscillator, PLL enabled, CLKO function on RA6 (ECPLL)
; CONFIG FOSC = ECPLLIO_EC ;EC oscillator, PLL enabled, port function on RA6 (ECPIO)
; CONFIG FOSC = EC_EC ;EC oscillator, CLKO function on RA6 (EC)
; CONFIG FOSC = ECIO_EC ;EC oscillator, port function on RA6 (ECIO)
; CONFIG FOSC = XTPLL_XT ;XT oscillator, PLL enabled (XTPLL)
; CONFIG FOSC = XT_XT ;XT oscillator (XT)
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