I have the 9ft 5wt mf Evotec which is easily my favourite 5wt. For light presentations and dry fly fishing I have found the eyebrook supa slick fly line a superb line, especially for the price. I'm not sure who manufactures this line but it sure is something special
EYEBROOK SUPA SLICK FLOATING FLY LINE from Eyebrook Tackle Shop
For more aggressive casting situations where I am trying to cover as much water as possible I use the Opti stillwater line, you can pick up and fire it out within one cast cutting down massively on false casting. It does come as a price though so if you are patient then ebay may be your best bet, they do pop up from time to time and often go for as little as £20 new.