If you're not very car savvy, a transmission swap is what you want to do, and even if you are car savy, I can't see why you'd bother unless you didn't want to lose acceleration off the line, but you'd still lose that anyway with the new FD ratio. If the transmission bolts to the engine, you're talking a day, maybe two, job versus much longer to take everything apart and I wouldn't be surprised if buying the parts separately costs more or close to a used transmission anyway. There's a reason most mechanics just swap them. It's not as simple as just cracking it open and changing out the gears. You should be able to get a fairly low mileage LS transmission for around $600, usually warrantied, from a wrecker (
Car-Part.com--Used Auto Parts Market).