Welcome to DGR!
I can offer a little advice.
First of all, I would recommend you build your bag around discs that are not Out of Production (OOP). The Valkyrie is an awesome mold, and I'm glad you like the Pro Valkyrie...the only problem is that you are going to have lots of trouble trying to keep your bag stocked with them. I would strongly suggest that you build your bag around molds/plastics that are easy to come by. OOP molds/plastics are a lot of trouble to hunt down and tend to be much more expensive.
Since you love the Valkyrie so much, I would throw the Champ and DX. It's hard to recommend the Champ Valkyrie, however, because it doesn't have as much glide as the other plastics. When you wear out the Champ Valkyrie, buy a Star Valkyrie to replace it. Yeah, I know your DX Valkyrie probably looks like a dog's chew toy, but it should still fly okay for awhile. Once the DX Valkyrie gets really beat up it will still be useful to you as a long distance roller.
I love the Leopard, too. It's a great disc, especially for someone new to the game. As you get better throwing, though, and are able to deliver more power into your snap, that Pro Leopard will start to turn way to the right. At some point you will have to purchase a more stable fairway driver, and I would recommend the Teebird. Keep throwing that Leopard, though.
***Here's a tip: Throw that Pro Leopard straight down the fairway as often as you can. If you do you will find that, as time goes by, that Leopard will require more and more of a hyzer release angle to keep it going straight. Keep throwing that Leopard with more and more of a hyzer release angle until you reach the point where, even if you are throwing the Leopard at a nearly vertical angle, it just won't go straight for you anymore. Use your X Comet the same way. Follow these instructions and you will become a master of the hyzer release, the most useful shot in disc golf.
Your X Comet and your Stingrays are very similar discs, too similar to keep both in a good bag setup. I would definitely pick one mold or the other, and I would strongly suggest you pick the X Comet. The X Comet is not only a great disc, but a great teaching tool, as well. As your X Comets break in, they will fly similar to Stingrays. Stingrays are good discs...there just not as useful as Comets.
The Wizard and Banger GT are very similar, too. I would pick one or the other. I like the Wizard, but putters are a very personal choice. Whichever feels better in your hand is probably the one that you will have the most confidence in. The Aviar flies differently than a Wizard or a Banger GT--I would keep the Aviar in the bag.
The Wraith is too much disc for you right now. Keep it in the closet. Until you are able to throw 350' consistently, there is no reason to keep it in your bag.
The FLX Avenger SS and the Sidewinder are so close to each other that they are nearly the same disc. Choose one and throw it. Your DX Valkyrie will fly very similar to both these discs. Since you like the Valkyrie so much, why throw anything else?
Also, I would get a very overstable driver for your bag. For a very overstable driver, I would highly recommend the Z Predator.
Your X XL is a great disc, too. Some people on this forum might disagree with me, but I think that the XL, especially in the X plastic, is too similar to the Leopard to warrant carrying both. The X XL can fly a little lower and a little farther than a Leopard, but not enough that you will notice a huge difference between the two. Since you like the Leopard, there is no reason to throw the XL. As you develop more power, though, you might find that the XL suits you better than the Leopard. Keep it in your closet next to your Wraith.
So, with my recommendations, your bag should look like the following:
Champ Valkyrie (get a Star Valkyrie)
Pro Leopard (Try a Champ or a Star Leopard, too)
Wizard (or Banger GT, pick one or the other)
In the Closet:
Once you are throwing farther I would add your Wraith. This bag would be all you ever need until you turn pro.