Hi Dan,
Although I have often been accused of being a gear slut (especially where guitars are concerned) if I were you I'd keep your £200 to soften the ADAA joining fee (county membership for you ?) !
If you are planning on mainly fishing dries I think your 9 foot 3wt should be okay - wind is as much a problem with a 3 or a 4 wt I would think, though a five would possibly make some difference.
Your 6wt would do on windy days or for targetting Sea Trout. Have you tried "underlining" it with a five 5 wt line to see how it feels ? Maybe try a Barrio GT90 #5 if you are wanting to fish "lighter" on that rod ??
I used a 10 foot 4 weight Streamflex XF2 all last season - dries, spiders, nymphs etc I just compromised and got on with it. I used different lines though, Barrio GT90 was really good for short work, and ironically I found a Mastery DT better for distance (loaded that particular rod more smoothly with more line out). Regarding distance, for me anything over 45 feet (15m) and my conversion of sucessful hook ups landed drops, unless I can keep line off the water and fish from stripping too much out, but that is maybe just me. Two or 3 rod lengths all the way if I can but as Sandy says you'll often find fish much further out, sometimes closer to the other bank. I just leave them and stalk those in those in 'my' range. Jeremy Lucas defines the optimum range as 6 to 10 m, though not everyone appears to agree with him !
I was going to get a 9 foot 4 wt for next season for dries, and may still, but after speaking to John Walker yesterday I am inspired to just stick with the one set up and continue to 'make it work' - the man uses gear older than me and only a couple of fly patterns and still catches more than me. That is a lesson !
Hope to see you out and about in 2012 !
Cheers,
Lindsay