I agree with Geo -- I haven't even looked at Hydroxycut in years, so I have no clue what version they're on by now lol.
But Alphamine is always a solid choice for sure. Part of it depends on how you do with stims, as well. Without looking at the Hydroxycut formula I couldn't say, but you could always go a no/low-stim route to stack with Alphamine if you're looking to stack.