Welcome to CS.
You leave me no choice but to recommend the Iberital Challenge. It will cost you well above the $300.00 I am afraid. It is a far better grinder than the one you mention and in my opinion, sometimes you have to extend yourself to get the best possible kit in the vicinity of your price bracket.
We can help you with that if you wish.
Otherwise, you may have to wait around until something suitable comes up second hand in the for sale section.
Hope this helps.
very first CS site sponsor