If you're going adjustable, Bahco are good. I'd also take a punt on anything made by C.K. or snap on tools.
They're only really useful (I find) for big jobs, so get one with a long handle. Like DJ says a full set of dedicated ones is much better especially for smaller or fiddly things. Much less likely to round off bolt edges
Edit - and useful to save weight and space like Stevo_com says
If you're going adjustable, Bahco are good. I'd also take a punt on anything made by C.K. or snap on tools.
They're only really useful (I find) for big jobs, so get one with a long handle. Like DJ says a full set of dedicated ones is much better especially for smaller or fiddly things. Much less likely to round off bolt edges
Edit - and useful to save weight and space like Stevo_com says