Specifically the CBF1000 which is amazingly comfortable and has excellent wind protection. But it's only VERY slightly more powerful.
You don't need to add import duty for the screen as you can buy it in the UK here http://www.bikehps.com/acatalog/Madstad_Screens_and_Brackets_for_Yamaha_FZS1000_FZ1_Fazer_2001-2005.htmlI just added the main website so you could read all about the theory etc.
Don't forget it is a full touring screen with base plate and adjustable brackets, not a £50 double bubble, check out the price of full touring screens for BWM and triumph etc.Have you done a search on here? loads of different options including fitting Gen2 (FZ1) touring screen etc.Also check out [size=78%]http://www.cartestsoftware.com/fz1/[/size] and more specifically http://www.cartestsoftware.com/fz1/windscreentests.html for ideas.
Why not get a set of ear plugs custom made to suit your needs. I usually wear diving type ear plugs which have different inserts and find them excellent.I fitted a MRA spoiler screen to the Fazer recently and today was the first day I had it out for a hi speed blast and it had less buffeting and wind noise which surprised me than the original even though it is shorter, but then I am only 5'9".
I commute 120 miles a day on my FZS. I have the Yamaha touring screen which is a good compromise for me (I'm 6'1"), but you will probably have to try a few before finding one that suits. Being naked, your legs get colder than the with a full fairing, but apart from that, it's superb for commuting - loads of roll on power at motorway speeds but narrow handlebars and flick up mirrors means it's really quick through traffic, something which can't be said of massive trailies like GS1200s and Triumph Tigers.If you're doing 20 or 30k miles per year, the most important consideration after mpg is servicing and the FZS is easy enough for most home mechanics bar the valve clearances, but they seem to need adjusting very infrequently which is good. Take a good look at how much servicing something like a VFR would cost - they're a bugger to work on and consequently expensive to service.Apart from that, the longevity of FZS1000s is extraordinary. I've just hit 132,754 miles and I've only just had to replace the discs and suspension bushes. All my Hondas and Kawaksakis needed these doing at less than 50k miles. This also keeps the cost down. Many parts are interchangeable with other Yamaha models too - discs, calipers etc so there's plenty out there. The only things you might find hard to get second hand are fairing inserts, rear calipers and the downpipes.
Get to the for sale section one there with all your needs & well within your price range