To answer the question, you can use your track saw as an approximation of a mitre saw. Make a cutting station top on your new work bench.
I would steer clear of Erbauer Tools.
No experience of Dewalt mitre saws, I have found the Makita saws being good for general DIY chopping.
Why do you want a new saw? Will you use it? Always hold off on purchasing until you really need something. These expensive toys are not always needed.
There are always multiple ways of doing the same process.
I used a mitre box and a mitre frame saw for years. I used a mitre box for trimming...
