I have a 6 year old Lexmark T630 that is about to die and need to replace it.

Can someone recommed a current model that comes with/I can buy an envelope feeder for (<25 at a time). It does NOT have to be networked.
I do have a couple of T63X toner cartriges for it ($300 ea) and would like to find a model that can use these, but if that is not possible, I am willing to consider another brand. The envelope feeder is mandatory.

Of course cheaper is better.