DeWalt 12" Compound Miter saw $337.17
Ryobi 12" Compound Miter Saw $149.99
I don't like the back fence on either one. But I have the DW715, it's a work horse.
But either way.... even $150 can buy a lot of chop service . . . until you really NEED the saw.
But if you must.. I would go with the "devil you know" and buy another Ryobi.
In 3 years when you have finished amortizing that $150, you can think about what you really need.
Oh, and as for Sliding Compound Miter saws..... that extra word in there can either work fine, or give you a whole lot of grief. A friend gave me his brand new one that was a year and a half old because he couldn't get a straight or properly mitered cut. Worked fine for me.... but then I'm used to finessing hand tools that don't have motors.....

I took it back to him and walked into his shop to see him testing his new 16" Chop.. (no miter... but he didn't find that out until about 7 months later...

)
Upshot was we sold the little slider on Craigslist and never looked back.