What is a used 12 qt. hobart mixer with all 3 attachments worth?

My friend's mom is selling one, I am considering checking it out/ posibly buying it. Not sure what they are worth. (Had been pricing a 20qt. and bidding on 20qt. at auction really had my heart set on a 20qt.) so am on the fence about buying a 12qt. Those of you who do enough biz to have commercial mixers is the 12qt worthwhile? Should I hold out for a 20qt. at a restaurant auction? Appreciate input on this as I mull over a possible purchase. Obviously I and my very mechanical brother will look over the mixer and try out the speeds listen to motor etc..etc.. (as soon as he is available to go over to her house with me).

I haven't bought one yet, but in my research the 12 qt could go anywhere from $600 to $2000, depending on condition and whether it's a liquidation auction or whether you're buying it from a dealer. Check ebay for similar listings, that may give you a better range. Good luck!!

Thanks! she is asking for 600.00 I am hoping to actually offer her a bit less.

I am just wondering if it will be a good size or if I will end up wishing I had just saved up for a 20 qt.