I heard combining the two can actually make your handling worse. Whats your .02 on it?

 

I have 350EVO swaybar and KW Variant 3 coilovers on my car right now.
I installed 350EVO swaybar last October and KW coilovers this Feburary.
I couldn't feel the definite improvement in handling when I installed the swaybar, but I did feel that car rolls less when I take some fast corners. The handling feel did get a little worse when I switched the provided Urethane bushing in 350EVO swaybar back to stock rubber bushing due to terrible squeaking it makes.

After I install the KW Variant 3 coilover, I noticeably could feel a great improvement in terms of handling. Turn-in used to be about half tempo slower in stock suspension system, but now turn-in reponse got a lot better. Rolling is also reduced.
I did not start to tweak aroung the rebound/compression setting yet, so I'm yet to find a optimal setting that fits my taste tho.
Stupid stock Bridgestone RE040 tires are always a problem for me, so I would get a conclusion after I get my rims and Toyo T1-S tires with some more tweaking on coilover setup.

I'd say it really depends which setup you take. Everyone's taste is different, and there are tons of choices out there you can make. But I don't really think the combination of good aftermarket coilovers and swaybars can actually make the car handle worse. If tire is not the problem, then it needs some proper setting I think.