I swear by the flyscreen. I have the Roadster also and much prefer the flyscreen. I only use the roadster when it's going to rain. The flyscreen really stops the windblast and I've been up to 110mph with no problem holding on whereas with no screen at all, 85mph and up is a real chore. I wear a full face helmet.
As for the best deals going, I have bought a ton of accessories from worldoftriumph.com. They are having an accessory sale with discounts up to 70% off. They have pacific blue and black flyscreens on sale as well as great pricing on seats, oil tank embellishers and tons of other stuff. I was nervous buying in the UK from here in the US but I paid via paypal and shipping was 5 days at very fair rates. Also check out the Autumn sale. I bought the Balfour jacket for $58 brand new versus $219 here in the States. I know I sound like a salesman for them but I literally bought $1000 worth of stuff from them for $500 shipped to my door.
Hope this helps.