Y3, you are on the mark as to the FSB, in addition, I've read that the FSB can actually offset the RSB gains--though I cannot speak to that personally.
Certainly replacing the RMM has been mentioned by several members, me too, as being a relatively inexpensive but effective mod in reducing engine movement during shifts. Do a thread search. I went with the e-Focus RMM and am really happy, but there are several choices--including Cobb, Mazda, and I think Steeda.
JBurks mentioned Ford Racing. Check out "Fordracingpartsdirect.com"
They offer a handling package for the Ford Focus, which is what I had installed. Differing a little bit with JB, my hatch w/o handling pckg lowered about 1 inch, maybe a bit more, but nothing that gives me a problem with speed bumps or curbs. My car feels more planted, takes corners better, doesn't dip and dive as much, etc.
As you already have the RSB and do not want the FSB, you probably can negotiate for the springs, shocks, struts.
You can do significantly better on the pricing through Mike @ Tousley Ford (now Auto Nation White Bear Lake), and maybe thru Andy @ Village Ford, one of the vendors here.
Finally, a short shifter. Relatively easy and inexpensive, and again several choices. I posted this morning under the Steeda thread on here. Check it out if you're interested.
Have fun man.