New or Used?
In used, I'd go 1980s-1990s Garden Tractor w/ Peerless or Dana Spicer geared transaxle or hydro k66 or stronger.
MTD 990, MTD GT1846, Craftsman GT 18-44", Simplicity, Ariens, Bolens, others can chime in on hydros.
Bet you'll find more than mowing duties on 1 acre.
Never touched new...