I'm thinking you should just get the 5-speed manual. I've heard that the shift/clutch feel is fantastic, and the trans is the proven MTX-75. It'll save you ~$1000 upfront (unless you get the Titanium), which is a lot of gas money that the Powershift would have to make up.
Mine: 2004 Subaru WRX Wagon: 116k, WRB
Gone: 2002 SVT, #1654
Hers: 2012 Focus Ti Sedan: 67k, SGM, Manual