just my .02 here
I had muffler elims from Corvette Central on my car. At first I loved them but after about a month, as you'll find with alot of people, it got old real quick and they came off the car.
They were just too loud IMO and I didn't care for the gurgling on deceleration.
I paid around $130 for mine and Jeff and I installed them.
If you buy elims make sure they have the necessary mounting brackets already welded to them. The advantage to buying them is you can install them yourself and not have to pay for labor.
My choice would be mufflers. You can cut your stock LT1 tips off and have them welded to whatever mufflers you decide to buy.
You're choices are pretty much unlimited.
I had a set of stainless stell Dynomax Ultra Flow Welded Race Mufflers from Summit in the garage waiting to go on my car when I got the B&B. I paid about $60 ea. for these and planned on using my stock LT1 tips with them. I got the 3" B&B for only $350 more than the mufflers cost me so back went the mufflers.
My advice would be to get around and hear as many different setups you can.