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Like everyone else said, get whatever exhaust you want. I don't get this back pressure crap people talk about. If that's the case then no one should ever even touch their exhaust and leave the stock **** on. For me the better the exhaust flow the more hp you get. I myself have shorty headers, I want long tubes, offroad x pipe into magnaflow race mufflers with dumps. Mine has more of a racy sound. If you want that deep rumble then flowmasters or something similar with chambers with do.
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Backpressure is an imaginary force that exists only in people's minds. I would not worry one bit about it. Instead, worry about the torque curve of your engine. Big primary headers can hurt low-end torque which is far from ideal for street use. Go ahead and run whatever exhaust system you prefer. I myself have BBK long tube headers and matching no-cat x-pipe on my '95 cobra. Also, I run delta 40's out back with the matching tailpipes. With a handful of other bolt-ons but no internal mods, it makes just a shade over 300 rwtq at 4000 rpm. And those are dyno-proven numbers, not numbers gathered from catalogues and best guestimates.