My 1260 (one model up) is extremely quiet. I haven't measured it, but my Eheim's head pressure is amazing and probably underrated a bit as opposed to most other pumps which overrate.
I also believe the 1250 also uses less electricity than the other pumps your are considering and will probably last forever. Finally, you can run it externally if you wish.
Of course it costs more, but you get what you pay for.
I am also a proponent of the "slow flow" sump. I've probably only got about 400gph or so going through my 35 (filled) gallons of sump (150 gallons total system volume). This is with the Eheim throttled back about 10% and tee'd off through a UV recirculating back into the sump.
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