Not used a Vision but could be okay, some peops seem to like them ? The Streamflex XF 11' is a 'wangy' affair I am reliably told - I opted for and XF2 Plus in a #3 for French Leader and nymphing in general, the one that extends from 9' 6 to 10'. I also have a 10' and 9' both in a #4, the 9' is a cracker. Jeremy Lucas loves his XF2 11' but he only fishes 'Leader To Hand', no fly line. IMHO the Streamflex's are one of the best value for money river rods out there - yes there are better rods but you'll pay quite a bit more for them ! Maybe an XF2 10' #3 or #2 would suit and with a local discount (assuming you are an ADAA member) it will be just over £200. Drop Goolager a line, he uses a 10' #3 XF2 but was considering a 2 wt ! I might get to use my 'plus' in anger on Monday as it looks like nymphs for the forseeable future...
Lindsay