Any chance of trying the guitar out in the shop (assuming it's from a shop) with a few different amps, or even better drag your gear down to the shop and plug it in and crank away?
That's one way of knowing what type of sound you will get!
Of course the sound you will get will depend on a number of factors, ie type of amp, speakers, effects etc that you may use.
Duncan (Seymour) make a very reputable pickup. Over the years I have used Duncan Invaders and Duncan Distortions in my guitars and have never had any problems.
Seymour Duncan is one of the great Pioneers in pickup design, I may need to be corrected here and will stand corrected but I believe Seymour Duncan to be one of the forerunners in pickup design, in particular the Humbucking pickup.