I was in the exact same situation last year, I picked the fastrak. Felt it was a little better made. My dealer who has been around for along time agreed, although he had nothing bad to say about the exmark.
A year later, no problems, (except paint on deck is chipping/peeling more then I'd like) still happy, but deep down wished I would have spent more on a super z.

 

I would buy the Hustler in your situation

 

Hustler for sure.

 

Hmmm I'd up the budget like two grand and get more mower