I say definately wait until the right saddle comes along! A good saddle is absolutely crucial for jumping and you don't want to settle. Plus, you can definately find a good used leather saddle for less then $2000! You can find a great used saddle for $1000! Even less if you shop around and keep your eyes open. The flatness or depth of the seat is just personal preference. You want it deep enough to feel secure in it, but flat enough that you can get out of it easily to go over a fence. I tend to think the deeper the better, but I ride a lot of green horses. I personally like knee rolls and thigh blocks as well for security. I'm not sure what the difference is between a "jumping" saddle and a "close contact", ask people and you'll get a million difference answers! I originally thought the difference was knee rolls but you can get close contact saddles with knee rolls, so who knows!