your able to get a Megatech (Futaba european/asian brand) 3PK for 200$ on Ebay or less. I held an M8, a Helios, and a R1 and really nothing felt as comfortable as a 3PK in my hand.
I dont feel any fatigue in my hand or arm even in 30+ minute nitro mains.
the 3PK owns all
A bit heavy, but very nice to work with.