There isn't anything else that you'd really "need". You already have the main components for a high powered and durable setup.
Sure, there are other parts available that will increase durability and power in other parts, but the chances of those original parts breaking on propane aren't too high, and velocity gains will be very minimal for the amount of money you'd pay.
About the only other part I'd really recommend is an aftermarket stainless steel sear. I am currently using the Carom one in one of my Hi-Capas and the trigger pull is now extremely crisp. You can feel precisely the breaking point. After using that for a bit and then going back to my Hi-Capa with the stock sear, you can immediately notice a difference. The stock sear just feels "soft" in comparison.
The Carom one is very expensive though, for such a small part. PDI has released one now as well, which I will be looking into and is cheaper.
Also, most other parts available are mostly for cosmetics or for extreme high performance setups where every little difference matters such as in competition race guns.
Personally, I put all those parts in, whether I need it or not... "just because."
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