I had a Street Triple for 2 years before I got the Fazer8. The best engine in a road bike I've had, enough torque and poke to go quick but not so much that you get to 100 in 5 seconds and be OTT. It makes a fantastic noise as well, the induction noise anyway. I wasnt good for touring so I got the Fazer8. The new Street with its exhaust in the proper place instead of by the pillion seat means you can stick some throwovers on without burning them, or you hands.
If you test ride the FZ8 and the Street I reckon most will go for the Street.
Downsides of the Triumph are service intervals, 12,000 miles for a valve check, and that service costs £500+ at a main dealer. The finish isnt so good either, things like chain arent so good. The price is creeping up too, especially if you start adding on bits from their catalogue. There could be some bargin 2012 models around next year,like the FZ8 as thats being updated.