My first pair of twin-tips were the Salomon 720s (the first year they came out, half blue/half white, and I have been riding them for the past 3 seasons.  They're pretty much indestructable.  I've been doing tons of rails on them and some pretty big jumps and they hold up well.  The only downside to them is that the tails are quite high enough to land switch in powder.  But otherwise, I would recommend them.
REMEMBER: It's 10% equipment, and 90% rider.