As a Voidmaster, Best Quality Crew Improvements would have a total of a -10 on the Acquisition check, so you'd need a 35 or less on the roll, not counting haggle factors.  (we have a PF of 45 at the moment)<br/><br/>A Best Quality Sentinel depends on what kind... a Best quality autocannon Sentinel would be a -10 for a voidmaster, a Multilaser one would be at +0, and a powerlifter Sentinel would be at +10.  A Landspeeder would have a total +30 on the check... (same rarity as an Autocannon Sentinel... remember, best quality increases the difficulty by 30)<br/><br/>Common Quality Soritas Armor is very rare, so one suit would be at +10.  (good quality for +0, and Best Quality for -20...)<br/><br/>I have no idea about the rarity of an Eldar Flip belt... ask Glyphstone.<br/><br/>You can use your voidfarer trade skill to haggle... it's based of agility, so you don't suck at it.