Intel read/writes: 170MBps/35MBps
Kingston r/w: 200/160
But Intel has more "support." An Intel X25-V 40GB is basicaly a iX25-M 80GB in half (half the chips, half the speed).
What about an A-DATA X25-M 80GB, it's Co-Intel "logo'd". But I havn't heard anything about them, other than they are $20-30 less.