First, about the micro-adjustable thing. Micro-adjustable just means that the tilt of the seatpost isn't limited to positions locked in place by groves between the seatpost and the clamp. Thompson seatposts are micro-adjustable, but there are a lot of others out there.
Here's a Thompson:


One that's not micro-adjustable will have ridges/grooves where the Thompson has two smooth surfaces w/the degree measurements. You can purchase one anywhere on the internet as long as you know what size you need.

As for the saddle, start with something alittle wider than your measurement (135-145mm range). Then, since you had soft tissue pain, get one with a cutout. You'll likely have to try a few (or 10) on before you find one that's perfect.