$1000 for a driveshaft? are you kidding me?
it's $300 tops for a brand new unit, and removal/installation is 5 minutes and only 8 bolts. you can install/remove a front shaft on the side of the street with a single open ended wrench - i've done it before.
on top of that, the front driveshaft has absolutely nothing to do with your DW.
something is worn out in the steering system and/or the alignment is bad. check everything...track bar, tire balance, ball joints, unit bearings, control arm bushings, TRE's, etc. identify whats bad and replace it, then get an alignment to make sure caster/toe is good.