Handles better? Need to quantify that a bit more.
Give consideration to the anti roll bars that you have already installed. Anti roll bars tend to increase understeer on the end of the car on which they are installed. They do this because they reduce the increase in negative camber that occurs as the suspension compresses on the outside (loaded side) of the car as it goes around a corner. Putting just a big ass front anti roll bar on tends to make the car run wide on corners or require additional steering input. If you want to be able to break the rear end loose to drift around a corner in a very tight auto cross course, then a lot of rear anti sway with less front anti sway might be the ticket.
If you are looking for flat out increase in your ability to pull Gs going around a corner, then perhaps you should be giving consideration to what rubber you are wearing on the car. If you want to get extreme in DOT approved tires, you might be able to fit something like a BF Goodrich G Force Rival S 1.5 in the 205/50 15 fit. Rolling radius will be significantly smaller than the more common 140 tire fits so your speedo will be screwed; but, tires wouldn't be your limiting factor. The G Force is a 200 ATQ tire so don't expect long life, don't drive in really heavy rain and don't even think about driving in the winter. In the tire sizes that easily match up with the 140 you are exceedingly limited in your performance tire options. The Michelin Premier A/S which is a favorite for the 140 in the 185/65 size is not a high performance tire. How radical do you want to go. If you put a sticky tire that can generate a lot of Gs at some point you need to consider stiffer springs to reduce the suspension compression under high cornering force or start playing with anti roll bars.
How fast do you want to go? Are you planning on heading to a track? As you increase your speed you need to increase your spring rates. Hitting a deflection in the road surface at 50 km/hr may cause a mild compression in the front suspension. Hit the same deflection at 150 km/hr may have you on the bump stops.
You need to figure out what you dislike about the handling right now. If you are looking for slightly better steering response, increasing the negative camber on the front and fiddling with toe may be a start - along with making sure the steering box and front suspension bushings aren't clapped out. Outright increases in roll stiffness, stiffer springs, higher spring rates and higher damping rate shocks will definitely give you the feel of a firmer ride. That does not necessarily translate in to a vehicle that gets around corners better.
