Early, to benefit from them asap. Like L2 and L3.
I think Cleave/Great Cleave is a viable option (that's why I mentioned it in Variants), although it is not enough to hold a group of monsters through DPS alone, so it's mostly useful to get initial aggro at the start of a fight. I doubt Whirlwind would make a big difference (because of cooldowns and inherent weakness of one-handed fighting), so I don't think it justifies the extra 3 feats.And, what do you think of this? (...)