ORIGINAL: maiden-crash
Nitro wing, the 450 is rated for 18 amps max (could even be 16, I have to recheck.) A 20 amp esc is more than enough, 30 amps is an overkill. The Park 480 generally runs of ESC of that size. The 370 will run of a 10 amp speedy, the 400 and a 15 amp speedy would be ideal ( the esc wouldn't even break a sweat if true to its rating.)
I just looked at the manual that came with my park 480 910KV
They recomend a 25-40 amp ESC
If you are a demanding pilot the 25 will burn out. I dont know anyone that would cut it that close.prop selection and flying style determine how much strain you are putting on your system.Small cheap batteries will also suffer from big bursts of drain.
The 370 will eat a 10 amp.I would go nothing less than a 12 and I'd be carefull with throttle management.