I say just buy a aftermarket h or x pipe with cats. Around here (cali) I've seen stock h pipes going for nearly 200 bucks. Why pay that much for stock stuff, when the cats are probably bad anyways. You will still have an issue passing smog. I barely passed smog when I had my stock h pipe on, then I got a magnaflow x with cats and it passed with flying colors- even better than my moms 97 toyota camry. Not only did I pass the sniffer but visual is no issue- plus it sounds awesome.
Evenutally you will want to upgrade your exhaust anyways. However, it would be nice to have an o/r h or x. My parents now live in a county where its only required to have a smog test when you sell your vehicle(instead of every two years), so I registered my car there. If I change to an o/r x I will only have to worry about a cop pulling me over and Citing me for no cats. EIther way, I love my x pipe even with the cats