As an owner of a Rega Planet, I can tell you that I have been very pleased. I haved owned it for several years & still think it compares favorably w/ others I have heard. You can find them used on several sites including Audiogon & eBay w/in your budget. Good luck & good Listening.
The used Sony ES SACD models can be found for under $500 and play redbook well and SACD very well. They come with a 5 year transferable warranty as long as you posess the original receipt. Make sure you ask for the original store receipt. Some recommended models are:
Sony SACD 222ES 5 disc less than $300
Sony SACD 333ES 5 disc around $300
Sony SACD 555ES 5 disc around $500
Sony NS999ES DVD SACD player less than $500
Sony DVP 9000ES older but well built and does 2 channel SACD very well and respectable DVD <$500
Sony DVP NC555ES 5 disc DVD CD and SACD <$250
I've owned the 222ES and currently use the 333ES. I consider them to be a good value on the used market.
I have the Rotel RCC-955 changer. This is a nice sounding player and a good value. I bought a Channel Islands VDA-2 DAC and power supply, a $750. "upgrade", and sent it back because I couldn't hear any difference.