I would recommend the DSA815 as well.
It's an incredible bang for buck entry level DSA.
As long as you understand that even though it's feature rich (and even more if you want), has a gorgeous display and is very compact, it's still an entry level by some of it's basic characteristics that don't even come close to 30 years old professionals SA's.
Phase noise is quite bad, not catastrophic but below standard to the point that you generally measure the phase noise of the DSA instead of the DUT.
DANL isn't great either. You need to use narrow RBW and preamp to the point that sweep time becomes slower that comfortable to achieve decent noise floor.
And talking about sweep time, I think this is the most annoying weakness of this DSA, the display refresh rate is much slower that the fastest sweep time, so forget about trying to capture any short event or glitch.
Any old SA does better in these areas, but the DSA-815 probably beats them flat in accuracy, automated measurements, ease of use, and many other areas where an analog front-end can't match a digital one.
But, an otherwise quite decent DSA like the DS-815 at 1500$ ? No one would have expected that a few years ago, so I think any beginner with that budget at hand should consider it seriously.
When you are just a hobbyist you don't do very serious measurement anyway, so this baby is perfectly adequate and allows you to play and experiment with all of the latest features you can find in more advanced tools.
You won't be able to do that with very old analog SA's.
One suggestion though, I would consider the TG version because for a few bucks more, it gives you a lot more usability and some insight at network analysis.
And you can't add it later, it has to be built in.