Hi Scer,
Yamaha R1's abound aplenty in the classifieds ads so if you want the same bike as you're already used to it, you should be able to pick one up no problem, even the same year and it'll save you a packet compared to a new one.
As for wet weather riding, there's plenty of riders/bikers who do so in the damp wet cold climate we have here, so you should be fine on that side of things, maybe ride some quieter roads to get used to it and then maybe tackle the bigger roads etc.
I'm not a biker - thought about it a few years ago and got to the front door of the showroom one time for a R6 - but didn't go through with it. When I do have some wonga lying around, I'll probably go for the Ariel Atom intead
Also, look in the various Biker magazines and of course the Biker onlien forums for more of a focussed picture.
Hope this helps!
Cheers, DtM! West London & Slough UK!