With that budget, it would be much better to find a used higher end saddle than a new or almost new el cheapo. For jumping, there are different snaffles you can choose from but while you're learning (assuming your horse is respectful) a dull bit is perfect - less finely tuned than others can offer BUT it will save your horse's mouth when, not if, but when you fall behind the jump and slam him in the mouth. Everyone does it to some degree when they are first learning, and having a sharp bit will make for a dissatisfied horse getting hit in the mouth. Besides, while you learn you will be taking a slower pace and not doing courses quite yet, so a dull bit should do. What is dull? An Eggbutt snaffle, a dee ring snaffe (single joint) or even a rubber bit if your horse is good enough. Once you start doing courses and moving up if you choose to, you will probably need a bit with more sensitivity. You don't need a full cheek, double joints, anything that says 'wire' to start out jumping.
I use shaped pads, well actually now a wither release pad that I LOVE. This gives the saddle some leeway, but there isn't anything compared to a great saddle fit. I have never been one to only ride in a full pad (the thin square ones) because it provides NO support or comfort and is only appropriate when the saddle perfectly fits the horse and rider, and the rider is perfectly balanced, etc. I hope this helps, feel free to PM if I can be of any other help. I love love love jumping, it is exciting. I hope you enjoy!