Hi Hog,
Welcome to the board.
I'm same build as you and have had both 900ss and 916 for both hooning and commuting. The 916 was fine as long as I didn't commute on it every day or my wrists we mincemeat. Not sure I'd want to do a long commute on one unless it was all over 70mph!
I've currently got a 900SL and love it to bits. If I had the cash I'd still get a 998 as it was, is, and will always be, one of the best bits of design ever penned. Buy the 748 for the design and the bills, or the 900 for the soul, torque and laugh.
Have fun either way.
Cheers,
ali