Thanks for the Survey Colins, I couldn't find the V550 in it, but the F1's are highly rated as a summer performance tyre. V550 is a new tyre to the UK, not many people stock it.
I did check that site Bazza, it is a good price but I can get them fitted, balanced etc, at a Tyre place next to where I work for £85.00, which is not bad really, and very convenient.
At the end of the day, I think I will stick with the F1's, and just turn up the Bose a bit, or perhaps buy some earplugs.
If I was swapping all 4, I think I might have gone for the Yoko's but I don't want to mix them if the gain is only the noise reduction.
Also being a tight Yorkshire Git buying the F1's means I can save thirty quid to spend on my other toy...
Thanks for all the comments.