I just bought a Precision Mathews PM-25MV with a DRO is under you budget, but is a small machine. A PM-45 or PM-932M are options that fit in your budget as well including shipping. The Grizzly machines are very similar and share many parts with the PM machines. Dealing with Precision Mathews you deal with Matt who is the owner. Some have mentioned having a tough time getting in touch with Matt. I have not had any difficulty, in fact I called him the day after Christmas with a question and he answered second ring. Keep in mind that any of the new machines are not ready right out of the box. I have had mine since the end of October and I am still tweaking thing and refining the set up. I would say that the Chinese machines are more like a kit than a complete package. None of the issues have been huge, just a large number. I have replaced striped bolts, re-threaded holes, honed gibs, cleaned and greased the whole machine, added lighting (not required), upgraded cheap screw/nuts/bolts with higher grade hardware, tightened loose electrical connections. I am a complete noob to machining, so this has been a valuable experience. A quality used machine may require a similar amount of time investment, so don't count it out.
A third choice would be a Charter Oak machine. I don't know much about them, but there are a number of Posts about them. Bill (wrmiller) has owned both a PM and a Charter Oak, so check out his posts.
I think you would not go wrong with a PM or Grizzly machine, I can't speak to the Charter Oak. Call Grizzly and Matt to see what they have in stock as lead times have been running 5 to 8 weeks and sometimes more for popular machines. You can discuss a package deal with Matt and maybe get some discounts or some added tools or upgrades. When I spoke to Matt last week he said he is expecting more PM-25MV's in January. I originally ordered a GO759 (G0704 with DRO) but it was out of stock and I would not have received it for 9 weeks, so I cancelled and ordered a PM-25MV from Matt and installed a DRO myself. I am very happy with my choice as the machine has a 3 year warranty, brushless motor, digital motor control and standard belt drive. I was planning to add the belt drive and brushless motor and digital control, so the two machines were with in $100 or so all fit out. The upside was getting the 3 year warranty, and a better DRO (DRO Pros 3M).
Good Luck!