300 disk W/ outboard DAC or single play W good dac

"good dac" is pretty hard to define, but even used you'd be hard pressed to get something older but recent for less than about $150-$250. That doesn' leave much room for a transport and cables. Maybe try a CAl Icon MK2 one box player.

If you go used, a Cambridge Audio D500SE is in your price range. It is a huge improvement over the older model HK I changer I used previously. If you own an old CDP with a digital out, you might consider an ART DI/O DAC. You can get one used here or new on the Internet for $200 or less plus the cost of cables and adapters. Requires the CDP have a BNC or RCA digital out. I now have that in my main system connected to a Sony DVP-S7700. Much better sound than the DVPs DACs. I don't know how it compares with the MSB, Datastream, or other DACs I have seen here in that price range.

Right now i have a Teac pd-d2750 5 disk player i bought at costco for 90 dollars. I think i might go for just a cdp and forget about the dac thing. they seem kna pricy when i could just get something like the nad which has Burr-Brown sigma delta 20 bit. or maybe i could splurge and get the C541 which also plays HDCD's for a hundred or so more.