for gsr200, best strings are warwick red label 105-45.
cheap and great sounding on that bass. just keep em fresh, replace them at least once a month, do a good setup and play. those sr200's are great basses for the $.
about DR's , yeah they are good, i did try them on gsr200, but IMHO red labels sounded the best.
here is how them reds sound
http://www.box.net/shared/sklu9glpsm
just straight in mic in on PC, no preamp/EQing, nothing. i think it was 100%neck, 80% bridge pickup.