In reply to marky:
My favourite is Inov8 X-Talon. They work well on steep grass when new, and are great on rock. They are expensive and wear down quickly, though. When worn down, they're still good for rocky approaches and descents in dry conditions.
I prefer Mudclaws for wet, grassy descents such as the approach to Stac an Fharaidh. Mudclaws feel odd on rock when new, as the spikes are so long, but they feel very secure when teetering around on grassy ledges over a big drop.
I haven't looked at what Decathlon has to offer, but Dan Arkle's advice sounds good too.
Cheers
Al