In reply to Neil Williams:
> (In reply to Steve nevers)
>
> I'm also not confident that erroneously clipping the harness the wrong side of the gate wouldn't cause some sort of damage or even failure.
> Neil
I've seen a BD Gridlock thats snapped at the small 'gate', results in a carabiner with a razorsharp edge, which is as we all know, is the kind of thing you don't want in a belay system!
I really would avoid the Gridlock, Mine might be handy for clipping my stinky shoes onto my bag to air i guess!
I'd say go for a Belay Master, its straight forward, can be 'converted' to a standard carabiner if the clip annoys you, and the clip has over handy uses.
Belay device, ATC XP. Looking at your requirements it seems to be the best of both worlds. Two slots, high and low friction side. Job bloody done.
Wouldn't bother with the ATC sport, the ATC XP is only about £1 more and its the same sodding thing as the sport but handles two ropes.