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: 2008 Saab 9-3 Aero SportCombi XWD: 87k, Black, Manual, JZW Stage 1. 320hp/400tq.
Gone: 2002 SVT, #1654
Hers: 2010 Focus SES: 78k, Ebony, Auto, Moon and Tune