Jazoil,
Your old screen maybe one of these [size=78%]
http://www.ebay.co.uk/itm/YAMAHA-FZS1000-FAZER-01-05-D-BUBBLE-SCREEN-ANY-COLOUR-NEW-/251073200312?pt=UK_Motorcycle_Parts&hash=item3a752100b8#ht_1025wt_1414[/size] as it looks quite thick acrylic.
As been said there is no magic screen, I have tried loads inc MRA Vario which I found too noisy.
I am 5'10" and I found:
Standard screen put wind blast on chest which then went up into my helmet and made my eyes water, also above 90mph gets hard to hang on for long distance work.
Yamaha/MRA touring screen, wind blast/noise around helmet and shoulders, too noisy for me. Sat up right at 90 + mph wind blast would grab the shoulders of my jacket and make the bike weave.
MRA Vario, found it same as standard screen with vane down or same as touring screen with vane up.
Skidmarx DB, far too noisy and too much buffeting around helmet.
Zero Gravity DB touring (the one with the extra wings on the side), rentahls and CRG levers fouled the screen, very noisy and caused the bike to weave very badly if sat up at 100 + mph (touring in Germany).
Currently use a Tech7 from a busters sale which I have found the best compromise for me so far, not too noisy and no wind blast buffeting around helmet, but it does limit comfortable sat up cruising speed to around 80-90 mph which is fine for me when riding in the UK. It is slightly taller than standard with a small flip.
Tech7
MRA Vario with vane upside down (worked better for me than right way up)
Zero Gravity with wings cut off for handlebar clearance
MRA Vario with top half of Yamaha touring screen added (utter crap, don't do it
)