Best 7mm out there now

On the subject of 7mm's. I was digging through my cartridge collection and realized my STW is missing. But when I moved to get away from my inlaws, I left a lot of things behind. Anyway, Id like to buy a 7 STW dummy cartridge, along with 7 PRC, and .28 Nosler, and any other wildcat 7's I dont have yet.
 
I am curious as I do have a 28 Nosler, multiple 7 RM and 7 WSMs... in terms of keeping it within a standard length action... the 28 Nosler has about the maximum performance you can get out of the length. So I'm curious... what does the 7 mm PRC offer that the 28 Nosler doesn't already meet or exceed. Not that I think the 28 is the be all end all cartridge... just curious. I gotta admit though that I'm starting to fall in love with the 7 WSM even though I'm a 300 magnum guy...
No rebated rim.
 
This is the 7's I have left.
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