Tough one but re-gearing might b in your future. I run 31's and have no issues w speed in fifth gear unless driving up hill. Some of our highways here have speed limits of 75 mph, I don't usually drive the speed limit in those areas but can. If going to 33's, u will have to 're gear but I think u will lose some of your top speed.
Speed shouldn't b an issue where u live. Invest in a bad @$$ system, sit back relax and enjoy the ride. Plus, if u get sick of the humming or growl of the exhaust, u can crank up the volume and drown out the sounds.
How is your acceleration now? I wish I could drive another standard, factory 2.5 and compare. My acceleration off the line is excellent, especially for a moving block w a small motor