Currently I'm using Makerware, but a few things I'd like to be able to do are:
1. vary the infill at different points in the part (currently, I'm designing support into parts and then printing at a fairly high infill %)
a. Can Simplify3D vary the infill in an XY fashion, or only per layer (z-direction)?

2. With some recent experiments in part adhesion, can you vary the temperature profile for different layers (hotter bed temp to start, then lower after a few layers, or vice versa)

I realize this is about Simplify3D, but does Slic3r have this same capability? Simplify3D seems to be a great program, but I'd prefer if I had some sort of 30 day free demo. $140 is a bit steep to pay for something when you don't know if it will do what you want it to do.