Ekidens are great shoes - I use a pair for track workouts (I don't actually race track so haven't bothered with spikes) - but they're quite a lot lighter than the OP was looking for.
Saucony Type A. Shocking durability(!), though the new Type A8 has apparently addressed this, but the shoe itself is pretty close weight-wise to what you're after, and performs well. Definitely fine up to HM if you're used to running in that kind of thing.