Help on ZTR !

I have 0.5 acer lawn. I also do aerate and detach each year.
I am looking for a entry ZTR. Anyone can give me some good ideas?

1. TORO SS420@HD
2.TROY MUSTANG 42XP@LOWES
3. HUSTLER RAPTOR 42@LOWES.

Which one has better quality? or I should go with riding mower? Any model to recommend?

Thanks.

Help on ZTR !