I hear
Hitachi H45MRY is awesome, but a bit pricey. I've tried most of
Hilti's demolition hammers (all of them are top notch), and I share a
TE-905 with a friend. Very powerfull, and it's ergonomical too. NOT cheap though.
A good mid range option would probably be the Hitachi
DH24PFT.
Make sure to wear vibro dampening gloves, fully covering clothes, hearing protection, protective specs, and a face mask when lifting floors. It's loud, dusty, and generally nasty business.
And oh: Knee pads are not optional
