I agree with crashnquilt in not worrying about it being too much machine for you if you can get it for a bargain. I am not familiar enough with APQS to know what size (throats) the Millis are.
That said, I think it is highly unusual that someone doesn't want to put a selling price out there especially for a machine that is computer guided. 2008 is only a 5 YO machine so relatively new in my mind. something not quite right that the seller isn't even giving you a ball park but wants you to submit an offer. I would offer her the same price as the HQ you were looking at with no bells or whistles. If you can get it for that price, find someway to get training on the machine and go for it!