I would not move the tank. The S-10 tank is in a good spot.
What we do is have both pipes go over to the passengers side. My mufflers are upright side by side on the passengers side, and then the drivers tailpipe crosses back over after it jumps over the axle.
I wouldn't go with lake pipes, personally.
I have an h-pipe, Since I had my exhaust done by a reputable shop (only thing I didn't do myself), they knew exactly where to put it. It doesn't hurt to put it in, but it's not necessary.
As far as mufflers, flowmaster and other companies have sound clips on their websites. I went with the 40 series delta flow flowmasters and they sound great on my 455. Quiet enough, but noisy when you're on it, and no drone in the cab.
Whatever you do, make sure the exhaust exits clear of the body and behind the rear wheels for the least noise inside the vehicle.
