If PS is your sole complaint, you can install an aftermarket PS for roughly crossbow $300, like I did. They're available for purchase on the internet. It works great and doesn't take long to install...a couple of hours or so, depending on your mechanic credentials and shop setup.
Cabs, both factory-installed and bolt-on, are pricey. You may also take a soft taxi for a much lower rate and more comfort.
What are your plans for the future?
If you have the opportunity, have a look at the Yanmar YT235C.
Drive a variety of compact tractors with cabs to see which one best...