Hi! Welcome to the forum! :)
I'm not familiar with your price range, but I will try to cover a large spectrum for you. I will start with the best.
There is no saddle greater than Devoucoux. Once you ride in one, no saddle is ever the same again. They're just... amazing. My personal favorite is the Devouxcoux Chiberta, which is a monoflap jumping saddle. Devoucoux saddles are quite expensive, but oftentimes on eBay
, you can find them used for a very reasonable price.
Custom Saddlery saddles are, and pardon my slang here, freaking awesome, too. You don't have to have the saddle custom made to you for them to be great saddles... used on eBay is definitely the way to go about getting a quality saddle at a low price!
In a perfect world, I would have a Devouxcoux Chiberta saddle for the jumping phases and a Custom Saddlery dressage saddle for dressage. However, they are expensive. But if you can swing it –*go for it!
Some other great brands are CWD, Amerigo, Beval, Hermes, and County. These are at the top of your list! :)
Now moving down to middle-of-the-road saddles we've got brands like HDR, Pessoa, Bates, Toulouse, and Stübben. Personally, I would place Stübben at the lower end, but we must acknowledge the decency of some of their products! When it comes to saddles in this region, don't go for older models. Getting newer models used is fine –*but old designs here tend to be, well, crappy. These brands tend to be kinder to your wallet.
And at the lower end of our spectrum we have Wintec, Circuit, Collegiate, and Ovation. Typically, these are saddles that are cheap, decent, and often "starter" saddles.
And this brings us to our "avoid at all costs" section! Kincade, Crosby, Miller's... anything that's generic... "starter kits," etc.
Now remember that I'm not saying that the more expensive, the better – it's not about price; it's about quality. Unfortunately, you get what you pay for. If you're truly serious about your equine career, do what you can to get saddles in the upper spectrum. Your tack makes a huge contribution to your success! Now, at the end of the day, you can put a bad rider in a good saddle and it's still a bad rider, or vice versa. But don't forget that your tack can actually inhibit your abilities as a rider.
Avoid "all-purpose" saddles –*or as a huge amount of professionals refer to them, "no purpose" saddles. Sometimes it is legal to compete in them, but it is in no way good.
Best of luck to you, and be sure to let us know about your adventures! ;D