Garcia cracks me up yet again.
I say keep the Sony DVP S7000 sell the other CDPs you don't need/use and get an external DAC. At $500 you have a lot of options. Over $500 there are even more. To me 9 CDPs sitting around the house not in use isn't a good thing. Sell a bunch of them and take that money and add onto your $500 budget and get a DAC with a good quality Coax cable.
I say keep the Sony DVP S7000 sell the other CDPs you don't need/use and get an external DAC. At $500 you have a lot of options. Over $500 there are even more. To me 9 CDPs sitting around the house not in use isn't a good thing. Sell a bunch of them and take that money and add onto your $500 budget and get a DAC with a good quality Coax cable.