I posed a similar question here when I bought my new place almost two years ago. Someone recommended Scag, and I owe them a beer or three.
I bought a 61" Tiger Cat, but I'm mowing some 7 acres, when I go over all of it.
I had pros smooth, prep, and seed the acre immediately surrounding the house last Fall, so that's about a 40 minute job.
The rest of the place is still pretty rough, with lost of bumps, stumps, and rocks. The Scag has been flawless!
I can get on it at daybreak and mow thick wet grass, and it just sprays a heavy green mist out the discharge chute and keeps on ripping.
The "Velocity" deck dedicates one the blade nearest the discharge to one drive motor, while the other feed it.
With your 1.5 acres, you wouldn't necessarily need five feet of cut, and if the property is somewhat uneven you'll experience less scalping with a smaller width deck.
Go and see a Scag dealer before you commit to anything else. He'll show you how well thought out and how well built these tanks of lawn mowers are.
Look at the steel thickness, the finish, the features, and I'm pretty sure you'll have one delivered to your new place.
Good credit gets you 0% financing too if you need that.
SCAG POWER EQUIPMENT - Commercial Zero Turn Riding Mowers