I just bought a pair of Tuff Rider boots for $79 to my door: http://www.sstack.com/apparelboots_l...ip-field-boot/
So far I like them, they run a little tall, but I'm assuming they'll settle down a bit the more I break them in. I have wide calves and WIDE is pretty close to being too tight; that being said... I like that they aren't leather, yet look just like it.
I haven't ridden in them, but I think they will be sufficient for a tight budget.
ETP: Just realized you're looking for dress boots, these are field, not sure if they offer them or not :(