Sr swaps with labor cost from $2500-$100,000 depending on hundreds of variables like: what car its going into, what parts you want with it, reputation of the company, the quality of work, what version of the SR you choose, weather or not you use imitation, private label, or brand name parts, etc, etc, etc.
s13 redtop vs s13 blacktop vs s14 notchtop vs s15 notchtop is totally dependent on how much you want to spend, what features you are looking for and how new of a motor you want.
There is a ton of information in the stickies up top of this section and in hundreds of posts archived in this section. So either search away or give me some specific detail as to what your looking for
-matt