I'm a Weatherbeeta fan - the Taka medium and heavyweights are just great, and they fit both my ultra chunky 15.2hh QH and my slim-line strange shaped mule. Had one tiny rip last winter but Jack lives out in the day in a group of very playful geldings. The cheaper Weatherbeeta ranges are the same nice fit but don't seem as sturdy.
Also Fal - beautiful rugs - try
www.equestrianclearance.com they usually have a cheaper selection of Fal rugs available, the full price ones are eye watering and I have never been able to bring myself to shell out that much on one rug to discover if they're worth it!
Tried a William Funnel turnout once and it fell apart within days - hopeless.
Very impressed with Shires lightweight turnouts, again great fit on the QH, not tried their winter rugs though. Prequestrian is an ebay shop who are dead helpful and they have the whole Shires range.
Finally I would be tempted by Premier Equestrian - got a few of their things and I like them - if it wasn't for the fact that I am something akin to the Imelda Marcos of rugs (I start to panic if I don't have a spare spare for every type of rug, which is frankly pathetic) I would give them a try this season. Liked their lightweight turnout with detachable neck very much and it seems very sturdy.
http://www.premierequine.co.uk/Happy shopping!