I also had a PC800 for several years... a red 1990 model. Was a great bike, but then I got married and started having kids.
I looked at the ST1300 in 2000, but never pulled the trigger on that one.
I bought my F6B a year ago and can't get enough ride time. The best bike I've ever had.
I think you'll be more than happy with your new toy... a PC800 on steroids!