laptop puchase field work bioacoustic research sound analysis

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i need a laptop for a coastal environment and to use with Word
the sound analysis programs eg are at:
durability is necessary, weight is not a factor nor battery drain and
replacement price for the inevitable
choosing an effective best buy can be novice confusing for example: a
Dell Inspiron 9400 v XPS M1710 is with add ons $1800 for an inspiron
and owowowo $3000 for the XPS
will the 9400 produce? and why is the XPS twice the 9400? is the XPS
more seaworthy?
what's the best buy for the purpose from any manufacturer?

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