If you're looking for cheaper alternatives, there are the 603's,
the Rode NT-5's, and the upcoming
Studio Projects C4's. However, I didn't get the impression that you were bargain-hunting.
I'd also take a look at the matched pair of Oktava MC-012's from The Sound Room (
www.oktava.com). For about $650, you get a matched pair of small diaphragm condensers, with Cardiod, HyperCardiod, and Omni capsules. These come with all of the documentation regarding the matching process, and (from what I've heard), the service is quite good. In addition, if you decide that you want to increase your choices, you can add a set of large diaphragme capsules (the LOMO M1), also matched pair, for an additional $850. That gives a tremendous amount of versatility for a price that's a little more than the KM184's.
Caveat: I haven't used these mics, but have it on good authority that they are terrific. I'm sure others here can add to the discussion.
Bottom line: you're probably going to find all of them to be pretty good mics. Then, it's up to the sound that you like. Personally, I'd go for the Oktavas, for their versatility.
-mg