Want to alter handling

[jwar]

I didnt bother ready everyone else's response because its as long as a book. But, you can get smaller front tires and bigger rear tires to reduce understeer. However, your car is front wheel drive so you need some decent sized front tires for reasonable traction.

[snacky]

Cheapest way to get more speed: Lose weight, go on a diet, take out everything backseats, carpeting, radio, speakers, spare tire, fat gf. or bf. etc.

[sickx]

Keep in mind that the famously great Focus stock suspension was designed as a SYSTEM. Merely replacing a single component is bound to have undesired affects.
In order to truly improve overall handling (i.e. not just go for looks by dropping the car), you need to consider the suspension as a system. That includes adjustable (or matched) shocks, bushings, and swaybars. If curing understeer is what you're after, consider replacing your shocks and/or rear swaybar.

If you're going on the cheap, there is a possibility that more aggressive front camber will help, but keep an eye on that tirewear pattern!