My buddy and I practically have clone cars of each others', all the way down to the exterior color. The main differences are that I'm running stock shorties and a cat'ed UPR X-pipe, whereas he's got LT's and an O/R H-pipe. We have exactly the same brand/diameter of cat-back.
Oddly enough, mine seems almost twice as loud as his in general cruising and at WOT. Also, he constantly has problems with his headers baking the solenoid on his starter whereas that's one headache I don't have to deal with. (Okay, so the starter design on a '90 differs from an '89, but still...)
I did have the option of going with LT's when I redid my exhaust, but I didn't want to deal with the heat-related issues (even if I invested in a starter blanket and/or coated headers), the annoying install woes, and hoping to get it past smog inspection even if I'd managed to find a short cat'ed H-pipe for a long-tube setup. That, and it was expensive as hell ... all that for the gain of, what, maybe 5hp over what I have now? Nah.
If you can stomach the cost, the install, the smog laws, and the driveability/reliability issues, then they might be okay, especially if you have some other major mods planned later. The stock headers were plenty well and good enough for my purposes, though, as they likely are for about 75% of others', as well.