Worthwhile crankset upgrade?

Currently have a sram rival crank with 53/39 now I've decided to drop down to 50/34 as this much better suites my riding, but do I just buy some new chainrings or a whole cranksets? Was looking at something like the sram Red, or FSA SL-K? Any opinions welcome!
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I happen to have a new Sram red/black compact chainset that is available after a project was shelved.
The SRAM Red/Black above will go well colour scheme-wise with Rival though.
Bozman What you looking for the Sram Red crankset then? Was going to wait until earlier next year, but for the right price seine may have to have a handmade Xmas present instead...
Are you after BB30 or gxp bb because it's a gxp. PM me if you are seriously interested.