Lots of suggestions and the thread is a few days old, so I'm probably not adding much. BUT, for whatever it's worth, here's my $.02.
Banshee is a great first true OS disc. At your D there should be enough of a difference between the Teebird and Banshee to warrant the latter, especially if you want to throw DX.
I used DX Banshees for a year and a half. They're capable of retaining their stability for a long time as long as you avoid a major impact. I spike hyzered one onto OB concrete once and it went from new and beefy to truly understable in that single impact. But I also had another in the bag for about 15 months that fulfilled its overstability role the entire time. They wear like Teebirds, losing LSS before HSS, so even if they start out as a meathook for you a little seasoning makes them a fantastically reliable straight to fade disc. A slightly seasoned Banshee is a thing of beauty.
My advice is to buy one and throw it in open conditions to see if it's the stability you're after. If you like it, buy one or two more in DX to have to cycle, working a fresh one in as you start to see the other season. If you have problems with big stability jumps from tree hits, you can always buy and carry a Champ Banshee to have in a pinch. Although be advised those are hella beefy at your distance.
If you play a lot of wooded courses where your discs take a lot of tree hits, DX may not treat you kindly. But if you play relatively open courses or have enviable amounts of accuracy, DX Banshees can retain their usefulness for a very long time.
This is making me want to pick one up for old time's sake.
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