Re: Plunge cutting tools
The first question I'd ask is why you need to remove the subfloor of the bathroom? This is not typically necessary unless it's damaged by rot or needs to be bolstered to support tile. The second thing I have to say is that you DO NOT want to cut out the subfloor without knowing that the wall you're cutting against is properly supported without it. Please describe what you're doing and why before proceeding.
Having said that, the best tool for the job will be a sawzall. Sawzall is both a brand name and generic term for reciprocating saw. There are many brands out there, and for someone who would use this type of saw occasionally, the likes of Craftsman and other "low end" brands will suffice. If you were a tradesman I'd be recommending high end equipment that can withstand the rigors of daily use.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!