The Petzl Sarken LeverLock Universal is a lightweight, technical mountaineering crampon, designed for mixed climbing routes.
The T-shaped front points allow you to drive into hard ice and climb mixed terrain with comfort, and also provide solid purchase in the snow. The Sarken crampons are durable yet slim and the Leverlock Universal bindings are compatible with all hiking and mountaineering boots with rear welts and the components (FIL or FLEX) make them adaptable to all types of boot toe (with or without welts).
If your only going to own one pair of crampons then look no further. These will cope with anything. I've used them ice climbing grade 2 waterfalls. I've got toe bails on my boots but didn't use them as the strap system is bulletproof.