The Stealth is the "basic" cooler, with the Spire & Max provided with higher tier chips.
That being said, the Stealth is included with the R3's too, and they're sufficient (if a bit louder than some aftermarket offerings) for some decent overclocks.
4GHz on a R5 1400 may be a bit of a stretch, regardless of voltage & cooling. 3.9GHz seems to be the upper end (generally).
You'll already have the Stealth cooler. I'd try it out first and if you can get your 3.9-4GHz OC stable, but temps aren't looking great (or it's too noisy); only then would I look to upgrade to an aftermarket.,