I have an HM Strat. What other strats come with big frets and slim necks? I have a MIM strat, but don't like the vintage frets and small radius fretboard. The neck isn't too fat but I like the HM Strat better.

I too own an HM Strat, and you will find the neck to be one of the best Fender ever made. It is also very unique, in that I have never played another Fender Strat that had neck dimensions similar to it. It is wide, flat and 24 frets. Rare amongst Strats.
Look for a newer model, with a 12" radius and 24 frets(Showmaster??). Vintage Strats don't feel anything like the HM.