First off all, if you already have a Bassani 3-piece x-pipe, then you don't even need to ask which brand LT you should get. Get the Bassani mid-length headers. It will fit perfectly with your current x-pipe; no need to get a new x-pipe or have a muffler shop hack it up.
Secondly, I notice you have an AUTO transmission, but Bassani said their mid-length headers are for MANUAL trans only. However, i have a AUTO 4r70w trans and those headers fit fine (after adjusting them by hand a little). it's only tight in one spot. I bought the Bassani headers without knowing they supposedly don't fit auto trans. It was like a month later when I threw away the box and instructions that I realize it says "manual only" on the instructions. maybe i was lucky or something and got a magical set of headers, lol. but in actuality, i just think that Bassani designed those headers on a car with manual trans and then they never bothered to put it on a auto to see if it fits.
About the steering shaft: without the ceramic coating, the header pipes will get very hot and melt one particular portion of the stock steering shaft. the portion in question is made of rubber.